/* Merged Plone Javascript file
 * This file is dynamically assembled from separate parts.
 * Some of these parts have 3rd party licenses or copyright information attached
 * Such information is valid for that section,
 * not for the entire composite file
 * originating files are separated by ----- filename.js -----
 */

/* ----- collapsiblesections.js ----- */
/*
 * This is the code for the collapsibles. It uses the following markup:
 *
 * <dl class="collapsible">
 *   <dt class="collapsibleHeader">
 *     A Title
 *   </dt>
 *   <dd class="collapsibleContent">
 *     <!-- Here can be any content you want -->
 *   </dd>
 * </dl>
 *
 * When the collapsible is toggled, then the dl will get an additional class
 * which switches between 'collapsedBlockCollapsible' and
 * 'expandedBlockCollapsible'. You can use this to style it accordingly, for
 * example:
 *
 * .expandedBlockCollapsible .collapsibleContent {
 *   display: block;
 * }
 *
 * .collapsedBlockCollapsible .collapsibleContent {
 *   display: none;
 * }
 *
 * If you add the 'collapsedOnLoad' class to the dl, then it will get
 * collapsed on page load, this is done, so the content is accessible even when
 * javascript is disabled.
 *
 * If you add the 'inline' class to the dl, then it will toggle between
 * 'collapsedInlineCollapsible' and 'expandedInlineCollapsible' instead of
 * 'collapsedBlockCollapsible' and 'expandedBlockCollapsible'.
 *
 * This file uses functions from register_function.js, cssQuery.js and
 * nodeutils.js.
 *
 */

function isCollapsible(node) {
    if (hasClassName(node, 'collapsible')) {
        return true;
    }
    return false;
};

function toggleCollapsible(event) {
    if (!event) var event = window.event; // IE compatibility

    if (!this.tagName && (this.tagName == 'DT' || this.tagName == 'dt')) {
        return true;
    }

    var container = findContainer(this, isCollapsible);
    if (!container) {
        return true;
    }

    if (hasClassName(container, 'collapsedBlockCollapsible')) {
        replaceClassName(container, 'collapsedBlockCollapsible', 'expandedBlockCollapsible');
    } else if (hasClassName(container, 'expandedBlockCollapsible')) {
        replaceClassName(container, 'expandedBlockCollapsible', 'collapsedBlockCollapsible');
    } else if (hasClassName(container, 'collapsedInlineCollapsible')) {
        replaceClassName(container, 'collapsedInlineCollapsible', 'expandedInlineCollapsible');
    } else if (hasClassName(container, 'expandedInlineCollapsible')) {
        replaceClassName(container, 'expandedInlineCollapsible', 'collapsedInlineCollapsible');
    }
};

function activateCollapsibles() {
    if (!W3CDOM) {return false;}

    var collapsibles = cssQuery('dl.collapsible');
    for (var i=0; i < collapsibles.length; i++) {
        var collapsible = collapsibles[i];

        var collapsible_header = cssQuery('dt.collapsibleHeader', collapsible)[0];
        collapsible_header.onclick = toggleCollapsible;

        if (hasClassName(collapsible, 'inline')) {
            // the collapsible should be inline
            if (hasClassName(collapsible, 'collapsedOnLoad')) {
                replaceClassName(collapsible, 'collapsedOnLoad', 'collapsedInlineCollapsible');
            } else {
                addClassName(collapsible, 'expandedInlineCollapsible');
            }
        } else {
            // the collapsible is a block
            if (hasClassName(collapsible, 'collapsedOnLoad')) {
                replaceClassName(collapsible, 'collapsedOnLoad', 'collapsedBlockCollapsible');
            } else {
                addClassName(collapsible, 'expandedBlockCollapsible');
            }
        }
    }
};

registerPloneFunction(activateCollapsibles);


/* ----- highlightsearchterms.js ----- */
function highlightTermInNode(node, word) {
    var contents = node.nodeValue;
    var index = contents.toLowerCase().indexOf(word.toLowerCase());
    if (index < 0){return false};

    var parent = node.parentNode;
    if (parent.className != "highlightedSearchTerm") {
        // make 3 shiny new nodes
        var hiword = document.createElement("span");
        hiword.className = "highlightedSearchTerm";
        hiword.appendChild(document.createTextNode(contents.substr(index, word.length)));
        parent.insertBefore(document.createTextNode(contents.substr(0, index)), node);
        parent.insertBefore(hiword, node);
        parent.insertBefore(document.createTextNode(contents.substr(index+word.length)), node);
        parent.removeChild(node);
    }
}

function highlightSearchTerms(terms, startnode) {
    // terminate if we hit a non-compliant DOM implementation
    if (!W3CDOM){return false};
    if (!terms){return false};
    if (!startnode){return false};

    for (var term_index=0; term_index < terms.length; term_index++) {
        // don't highlight reserved catalog search terms
        var term = terms[term_index];
        var term_lower = term.toLowerCase();
        if (term_lower != 'not'
            && term_lower != 'and'
            && term_lower != 'or') {
            walkTextNodes(startnode, highlightTermInNode, term);
        }
    }
}

function getSearchTermsFromURI(uri) {
    var query;
    if (typeof decodeURI != 'undefined') {
        query = decodeURI(uri);
    } else if (typeof unescape != 'undefined') {
        // _robert_ ie 5 does not have decodeURI 
        query = unescape(uri);
    } else {
        // we just try to be lucky, for single words this will still work
    }
    var result = new Array();
    if (window.decodeReferrer) {
        var referrerSearch = decodeReferrer();
        if (null != referrerSearch && referrerSearch.length > 0) {
            result = referrerSearch;
        }
    }
    var qfinder = new RegExp("searchterm=([^&]*)", "gi");
    var qq = qfinder.exec(query);
    if (qq && qq[1]) {
        var terms = qq[1].replace(/\+/g,' ').split(/\s+/);
        for (var i=0; i < terms.length; i++) {
            if (terms[i] != '') {
                result.push(terms[i]);
            }
        }
        return result;
    }
    return result.length == 0 ? false : result;
}

function highlightSearchTermsFromURI() {
    // terminate if we hit a non-compliant DOM implementation
    if (!W3CDOM){return false};

    // search-term-highlighter function --  Geir Bækholt
    var terms = getSearchTermsFromURI(window.location.search);
    // make sure we start the right place so we don't higlight menuitems or breadcrumb
    var contentarea = getContentArea();
    highlightSearchTerms(terms, contentarea);
}

registerPloneFunction(highlightSearchTermsFromURI);


/* ----- se-highlight.js ----- */
/* List of search engine matchers and the referrer search
 * code where carefully borrowed from the
 * "Search Engine Keyword Highlight" by Scott Yang,
 * see http://fucoder.com/code/se-hilite/ for further
 * details.
 */
var searchEngines = [
    ['^http://(www)?\\.?google.*', 'q='],              // Google
    ['^http://search\\.yahoo.*', 'p='],                // Yahoo
    ['^http://search\\.msn.*', 'q='],                  // MSN
    ['^http://search\\.aol.*', 'userQuery='],          // AOL
    ['^http://(www\\.)?altavista.*', 'q='],            // AltaVista
    ['^http://(www\\.)?feedster.*', 'q='],             // Feedster
    ['^http://search\\.lycos.*', 'query='],            // Lycos
    ['^http://(www\\.)?alltheweb.*', 'q=']             // AllTheWeb
]

function decodeReferrer(ref) {
    // checks if we are beeing searched by a search engine
    if (null == ref && document.referrer) {
        ref = document.referrer;
    }
    if (!ref) return null;

    var match = new RegExp('');
    var seQuery = '';
    for (var i = 0; i < searchEngines.length; i ++) {
        match.compile(searchEngines[i][0], 'i');
        if (ref.match(match)) {
            match.compile('^.*'+searchEngines[i][1]+'([^&]+)&?.*$');
            seQuery = ref.replace(match, '$1');
            if (seQuery) {
                seQuery = decodeURIComponent(seQuery);
                seQuery = seQuery.replace(/\'|"/, '');
                return seQuery.split(/[\s,\+\.]+/);
            }

        }
    }
    return null;
}


/* ----- first_input_focus.js ----- */
// Focus on error 
function setFocus(){
    // terminate if we hit a non-compliant DOM implementation
    if (!W3CDOM){return false};

    var xre = new RegExp(/\berror\b/);
    // Search only forms to avoid spending time on regular text
    for (var f = 0; (formnode = document.getElementsByTagName('form').item(f)); f++){
        // Search for errors first, focus on first error if found
        for (var i = 0; (node = formnode.getElementsByTagName('div').item(i)); i++) {
            if (xre.exec(node.className)){
                for (var j = 0; (inputnode = node.getElementsByTagName('input').item(j)); j++) {
                    try {
                        if (inputnode.focus) { // check availability first
                            inputnode.focus();
                            return;
                        }
                    } catch(e) {
                        // try next one, this can happen with a hidden or
                        // invisible input field
                    }
                }
            }
        }
    }
}
registerPloneFunction(setFocus)


/* ----- folder_contents_filter.js ----- */
// Actions used in the folder_contents view
function submitFolderAction(folderAction) {
    document.folderContentsForm.action = document.folderContentsForm.action+'/'+folderAction;
    document.folderContentsForm.submit();
}

function submitFilterAction() {
    document.folderContentsForm.action = document.folderContentsForm.action+'/folder_contents';
    filter_selection=document.getElementById('filter_selection');
    for (var i =0; i < filter_selection.length; i++){
        if (filter_selection.options[i].selected) {
            if (filter_selection.options[i].value=='#') {
                document.folderContentsForm.filter_state.value='clear_view_filter';
            }
            else {
                document.folderContentsForm.filter_state.value='set_view_filter';
            }
        }
    }
    document.folderContentsForm.submit();
}



/* ----- folder_contents_hideAddItems.js ----- */
// function to hide the traditional add items pull down menu.

function hideTraditionalAddItemPullDown() {
    // Get the old style Add Item pulldown. We already have
    // such a menu. This is only for system that don't have javascript
    // so we can savely remove it.
    pullDown = document.getElementById('traditional-add-item-pulldown');
    if (pullDown) { 
        pullDown.style.display='none';
    }
}

registerPloneFunction(hideTraditionalAddItemPullDown)

/* ----- styleswitcher.js ----- */
// StyleSwitcher functions written by Paul Sowden
function setActiveStyleSheet(title, reset) {
    // terminate if we hit a non-compliant DOM implementation
    if (!W3CDOM){return false};

    var i, a, main;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
        if (a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
            a.disabled = true;
            if (a.getAttribute("title") == title) {
                a.disabled = false;
            }
        }
    }
    if (reset == 1) {
        createCookie("wstyle", title, 365);
    }
};

function setStyle() {
    var style = readCookie("wstyle");
    if (style != null) {
        setActiveStyleSheet(style, 0);
    }
};
registerPloneFunction(setStyle);




/* ----- table_sorter.js ----- */

/********* Table sorter script *************/
// Table sorter script, thanks to Geir Bækholt for this.
// DOM table sorter originally made by Paul Sowden 

function compare(a,b)
{
    au = new String(a);
    bu = new String(b);

    if (au.charAt(4) != '-' && au.charAt(7) != '-')
    {
    var an = parseFloat(au)
    var bn = parseFloat(bu)
    }
    if (isNaN(an) || isNaN(bn))
        {as = au.toLowerCase()
         bs = bu.toLowerCase()
        if (as > bs)
            {return 1;}
        else
            {return -1;}
        }
    else {
    return an - bn;
    }
}
function getConcatenedTextContent(node) {
    var _result = "";
      if (node == null) {
            return _result;
      }
    var childrens = node.childNodes;
    var i = 0;
    while (i < childrens.length) {
        var child = childrens.item(i);
        switch (child.nodeType) {
            case 1: // ELEMENT_NODE
            case 5: // ENTITY_REFERENCE_NODE
                _result += getConcatenedTextContent(child);
                break;
            case 3: // TEXT_NODE
            case 2: // ATTRIBUTE_NODE
            case 4: // CDATA_SECTION_NODE
                _result += child.nodeValue;
                break;
            case 6: // ENTITY_NODE
            case 7: // PROCESSING_INSTRUCTION_NODE
            case 8: // COMMENT_NODE
            case 9: // DOCUMENT_NODE
            case 10: // DOCUMENT_TYPE_NODE
            case 11: // DOCUMENT_FRAGMENT_NODE
            case 12: // NOTATION_NODE
                // skip
                break;
        }
        i ++;
    }
    return _result;
}

function sort(e) {
    var el = window.event ? window.event.srcElement : e.currentTarget;

    // a pretty ugly sort function, but it works nonetheless
    var a = new Array();
    // check if the image or the th is clicked. Proceed to parent id it is the image
    // NOTE THAT nodeName IS UPPERCASE
    if (el.nodeName == 'IMG') el = el.parentNode;
    //var name = el.firstChild.nodeValue;
    // This is not very robust, it assumes there is an image as first node then text
    var name = el.childNodes.item(1).nodeValue;
    var dad = el.parentNode;
    var node;
    
    // kill all arrows
    for (var im = 0; (node = dad.getElementsByTagName("th").item(im)); im++) {
        // NOTE THAT nodeName IS IN UPPERCASE
        if (node.lastChild.nodeName == 'IMG')
        {
            lastindex = node.getElementsByTagName('img').length - 1;
            node.getElementsByTagName('img').item(lastindex).setAttribute('src',portal_url + '/arrowBlank.gif');
        }
    }
    
    for (var i = 0; (node = dad.getElementsByTagName("th").item(i)); i++) {
        var xre = new RegExp(/\bnosort\b/);
        // Make sure we are not messing with nosortable columns, then check second node.
        if (!xre.exec(node.className) && node.childNodes.item(1).nodeValue == name) 
        {
            //window.alert(node.childNodes.item(1).nodeValue;
            lastindex = node.getElementsByTagName('img').length -1;
            node.getElementsByTagName('img').item(lastindex).setAttribute('src',portal_url + '/arrowUp.gif');
            break;
        }
    }

    var tbody = dad.parentNode.parentNode.getElementsByTagName("tbody").item(0);
    for (var j = 0; (node = tbody.getElementsByTagName("tr").item(j)); j++) {

        // crude way to sort by surname and name after first choice
        a[j] = new Array();
        a[j][0] = getConcatenedTextContent(node.getElementsByTagName("td").item(i));
        a[j][1] = getConcatenedTextContent(node.getElementsByTagName("td").item(1));
        a[j][2] = getConcatenedTextContent(node.getElementsByTagName("td").item(0));        
        a[j][3] = node;
    }

    if (a.length > 1) {
    
        a.sort(compare);

        // not a perfect way to check, but hell, it suits me fine
        if (a[0][0] == getConcatenedTextContent(tbody.getElementsByTagName("tr").item(0).getElementsByTagName("td").item(i))
           && a[1][0] == getConcatenedTextContent(tbody.getElementsByTagName("tr").item(1).getElementsByTagName("td").item(i))) 
        {
            a.reverse();
            lastindex = el.getElementsByTagName('img').length - 1;
            el.getElementsByTagName('img').item(lastindex).setAttribute('src', portal_url + '/arrowDown.gif');
        }

    }
    
    for (var j = 0; j < a.length; j++) {
        tbody.appendChild(a[j][3]);
    }
}
    
function initalizeTableSort(e) {
    // terminate if we hit a non-compliant DOM implementation
    if (!W3CDOM){return false};

    var tbls = document.getElementsByTagName('table');
    for (var t = 0; t < tbls.length; t++)
        {
        // elements of class="listing" can be sorted
        var re = new RegExp(/\blisting\b/)
        // elements of class="nosort" should not be sorted
        var xre = new RegExp(/\bnosort\b/)
        if (re.exec(tbls[t].className) && !xre.exec(tbls[t].className))
        {
            try {
               var thead = tbls[t].getElementsByTagName("thead").item(0);
                var node;
                // set up blank spaceholder gifs
                blankarrow = document.createElement('img');
                blankarrow.setAttribute('src', portal_url + '/arrowBlank.gif');
                blankarrow.setAttribute('height',6);
                blankarrow.setAttribute('width',9);
                // the first sortable column should get an arrow initially.
                initialsort = false;
                for (var i = 0; (node = thead.getElementsByTagName("th").item(i)); i++) {
                    // check that the columns does not have class="nosort"
                    if (!xre.exec(node.className)) {
                        node.insertBefore(blankarrow.cloneNode(1), node.firstChild);
                        node.style.cursor = 'pointer';
                        if (!initialsort) {
                            initialsort = true;
                            uparrow = document.createElement('img');
                            uparrow.setAttribute('src', portal_url + '/arrowUp.gif');
                            uparrow.setAttribute('height',6);
                            uparrow.setAttribute('width',9);
                            node.appendChild(uparrow);
                        } else {
                            node.appendChild(blankarrow.cloneNode(1));
                        }
    
                        if (node.addEventListener) node.addEventListener("click",sort,false);
                        else if (node.attachEvent) node.attachEvent("onclick",sort);
                    }
                }
            } catch(er) {}
        }
    }
}   
// **** End table sort script ***
registerPloneFunction(initalizeTableSort)   



/* ----- calendar_formfield.js ----- */
// jscalendar glue -- Leonard Norrgård <vinsci@*>
// This function gets called when the user clicks on some date.
function onJsCalendarDateUpdate(cal) {
    var year   = cal.params.input_id_year;
    var month  = cal.params.input_id_month;
    var day    = cal.params.input_id_day;
    // var hour   = cal.params.input_id_hour;
    // var minute = cal.params.input_id_minute;

    // cal.params.inputField.value = cal.date.print('%Y/%m/%d %H:%M'); // doesn't work in Opera, don't use time now
    //cal.params.inputField.value = cal.date.print('%Y/%m/%d'); // doesn't work in Opera
    var daystr = '' + cal.date.getDate();
    if (daystr.length == 1)
    	daystr = '0' + daystr;
    var monthstr = '' + (cal.date.getMonth()+1);
    if (monthstr.length == 1)
	monthstr = '0' + monthstr;
    cal.params.inputField.value = '' + cal.date.getFullYear() + '/' + monthstr + '/' + daystr

    year.value  = cal.params.inputField.value.substring(0,4);
    month.value = cal.params.inputField.value.substring(5,7);
    day.value   = cal.params.inputField.value.substring(8,10);
    // hour.value  = cal.params.inputField.value.substring(11,13);
    // minute.value= cal.params.inputField.value.substring(14,16);
}


function showJsCalendar(input_id_anchor, input_id, input_id_year, input_id_month, input_id_day, input_id_hour, input_id_minute, yearStart, yearEnd) {
    // do what jscalendar-x.y.z/calendar-setup.js:Calendar.setup would do
    var input_id_anchor = document.getElementById(input_id_anchor);
    var input_id = document.getElementById(input_id);
    var input_id_year = document.getElementById(input_id_year);
    var input_id_month = document.getElementById(input_id_month);
    var input_id_day = document.getElementById(input_id_day);
    // var input_id_hour = document.getElementById(input_id_hour);
    // var input_id_minute = document.getElementById(input_id_minute);
    var format = 'y/mm/dd';

    var dateEl = input_id;
    var mustCreate = false;
    var cal = window.calendar;

    var params = {
        'range' : [yearStart, yearEnd],
        inputField : input_id,
        input_id_year : input_id_year,
        input_id_month: input_id_month,
        input_id_day  : input_id_day
        // input_id_hour : input_id_hour,
        // input_id_minute: input_id_minute
    };

    function param_default(pname, def) { if (typeof params[pname] == "undefined") { params[pname] = def; } };

    param_default("inputField",     null);
    param_default("displayArea",    null);
    param_default("button",         null);
    param_default("eventName",      "click");
    param_default("ifFormat",       "%Y/%m/%d");
    param_default("daFormat",       "%Y/%m/%d");
    param_default("singleClick",    true);
    param_default("disableFunc",    null);
    param_default("dateStatusFunc", params["disableFunc"]); // takes precedence if both are defined
    param_default("dateText",       null);
    param_default("firstDay",       1);
    param_default("align",          "Bl");
    param_default("range",          [1900, 2999]);
    param_default("weekNumbers",    true);
    param_default("flat",           null);
    param_default("flatCallback",   null);
    param_default("onSelect",       null);
    param_default("onClose",        null);
    param_default("onUpdate",       null);
    param_default("date",           null);
    param_default("showsTime",      false);
    param_default("timeFormat",     "24");
    param_default("electric",       true);
    param_default("step",           2);
    param_default("position",       null);
    param_default("cache",          false);
    param_default("showOthers",     false);
    param_default("multiple",       null);

    if (!(cal && params.cache)) {
	window.calendar = cal = new Calendar(params.firstDay,
	     null,
	     onJsCalendarDateUpdate,
	     function(cal) { cal.hide(); });
	cal.time24 = true;
	cal.weekNumbers = true;
	mustCreate = true;
    } else {
        cal.hide();
    }
    cal.showsOtherMonths = false;
    cal.yearStep = 2;
    cal.setRange(yearStart,yearEnd);
    cal.params = params;
    cal.setDateStatusHandler(null);
    cal.getDateText = null;
    cal.setDateFormat(format);
    if (mustCreate)
	cal.create();
    cal.refresh();
    if (!params.position)
        cal.showAtElement(input_id_anchor, null);
    else
        cal.showAt(params.position[0], params.position[1]);
    return false;
}


// This function updates a hidden date field with the current values of the widgets
function update_date_field(field, year, month, day, hour, minute, ampm)
{
    var field  = document.getElementById(field)
    var date   = document.getElementById(date)
    var year   = document.getElementById(year)
    var month  = document.getElementById(month)
    var day    = document.getElementById(day)
    var hour   = document.getElementById(hour)
    var minute = document.getElementById(minute)
    var ampm   = document.getElementById(ampm)

    if (0 < year.value)
    {
        // Return ISO date string
        // Note: This relies heavily on what date_components_support.py puts into the form.
        field.value = year.value + "-" + month.value + "-" + day.value + " " + hour.value + ":" + minute.value
        // Handle optional AM/PM
        if (ampm && ampm.value)
            field.value = field.value + " " + ampm.value
    } 
    else 
    {
        // Return empty string
        field.value = ''
        // Reset widgets
        month.options[0].selected = 1
        day.options[0].selected = 1
        hour.options[0].selected = 1
        minute.options[0].selected = 1
        if (ampm && ampm.options)
            ampm.options[0].selected = 1
    }
}




/* ----- calendarpopup.js ----- */

// The calendar popup show/hide:

    function showDay(date) {
        document.getElementById('day' + date).style.visibility = 'visible';
        return true;
    }    
    function hideDay(date) {
        document.getElementById('day' + date).style.visibility = 'hidden';
        return true;
    }


 




/* ----- ie5fixes.js ----- */
/* Mike Malloch's fixes for Internet Explorer 5 - 
 * We dont care too much about IE5,
 * But these stop if from spitting errormessages at the user 
 */
function hackPush(el){
    this[this.length] = el;
}

function hackPop(){
    var N = this.length - 1, el = this[N];
    this.length = N
    return el;
}

function hackShift(){
    var one = this[0], N = this.length;
    for (var i = 1; i < N; i++){
            this[i-1] = this[i];
    }
    this.length = N-1
    return one;
}

var testPushPop = new Array();
if (testPushPop.push){
}else{
    Array.prototype.push = hackPush
    Array.prototype.pop = hackPop
    Array.prototype.shift = hackShift;
}

/* ----- formUnload.js ----- */
/* BeforeUnload form processing */
if (!window.beforeunload) (function() {
    var BeforeUnloadHandler = function() {
        var self = this;

        this.message = window.form_modified_message ||
            "Your form has not been saved. All changes you have made will be lost.";

        this.forms = [];
        this.chkId = [];
        this.chkType = new this.CheckType();
        this.handlers = [this.isAnyFormChanged];
        this.submitting = false;

        this.execute = function(event) {
            if (self.submitting) return;
            if (!event) event = window.event;

            for (var i = 0; i < self.handlers.length; i++) {
                var fn = self.handlers[i];
                var message = message || fn.apply(self);
            }
            if (message===true) message = self.message;
            if (message===false) message = undefined;
            if (event && message) { event.returnValue = message; }
            return message;
        }
        this.execute.tool = this;
    }
    var Class = BeforeUnloadHandler.prototype;

    // form checking code
    Class.isAnyFormChanged = function() {
        for (var i=0; i < this.forms.length; i++) {
            var form = this.forms[i];
            if (this.isElementChanged(form)) {
                return true;
            }
        }
        return false;
    }
    Class.addHandler = function(fn) {
        this.handlers.push(fn);
    }
    Class.onsubmit = function() {
        var tool = window.onbeforeunload && window.onbeforeunload.tool;
        tool.submitting = true;
    }
    Class.addForm = function(form) {
        for (var i = 0; i < this.forms.length; i++) {
            if (this.forms[i]==form) return;
        }
        this.forms.push(form);
        form.onsubmit = this.onsubmit;
        var elements = form.getElementsByTagName('input');
        for (var j = 0; j < elements.length; j++) {
            var ele = elements[j];
            if (ele.type=='hidden') {
                ele.setAttribute('originalValue', ele.defaultValue);
            }
        }
    }
    Class.addForms = function() {
        for (var i = 0; i < arguments.length; i++) {
            var element = arguments[i];
            if (!element) continue;
            if (element.tagName=='FORM') {
                this.addForm(element);
            }
            else {
                var forms = element.getElementsByTagName('form');
                for (var j = 0; j < forms.length; j++) {
                    this.addForm(forms[j]);
                }
            }
        }
    }
    Class.removeForms = function() {
        for (var i = 0; i < arguments.length; i++) {
            var element = arguments[i];
            if (!element) continue;
            if (element.tagName=='FORM') {
                for (var j = 0; j < arguments.length; j++) {
                    if (this.forms[j] == element) {
                        this.forms.splice(j--, 1);
                        element.onsubmit=null;
                    }
                }
            } else {
                var forms = element.getElementsByTagName('form');
                for (var j = 0; j < forms.length; j++) {
                    this.removeForms(forms[j]);
                }
            }
        }
    }

    Class.CheckType = function() {};
    var c = Class.CheckType.prototype;
    c.checkbox = c.radio = function(ele) {
        return ele.checked != ele.defaultChecked;
    }
    c.password = c.textarea = c.text = function(ele) {
        return ele.value != ele.defaultValue;
    }
    // hidden: cannot tell on Mozilla without special treatment
    c.hidden = function(ele) {
        var orig = ele.getAttribute("originalValue");
        return orig && (ele.value != orig);
    }

    c['select-one'] = function(ele) {
        for (var i=0 ; i < ele.length; i++) {
            var opt = ele.options[i];
            if ( opt.selected != opt.defaultSelected) {
                if (i===0 && opt.selected) continue; /* maybe no default */
                return true;
            }
        }
        return false;
    }

    c['select-multiple'] = function(ele) {
        for (var i=0 ; i < ele.length; i++) {
            var opt = ele.options[i];
            if ( opt.selected != opt.defaultSelected) {
                return true;
            }
        }
        return false;
    }

    Class.chk_form = function(form) {
        var elements = form.elements;
        for (var i=0; i < elements.length; i++ ) {
            var element = elements[i];
            if (this.isElementChanged(element)) {
                return true;
            }
        }
        return false;
    }

    Class.isElementChanged = function(ele) {
        var method = ele.id && this.chkId[ele.id];
        if (!method && ele.type && ele.name)
            method = this.chkType[ele.type];
        if (!method && ele.tagName)
            method = this['chk_'+ele.tagName.toLowerCase()];

        return method? method.apply(this, [ele]) : false;
    };

    window.onbeforeunload = new BeforeUnloadHandler().execute;
    
    registerPloneFunction(function() {
        // terminate if we hit a non-compliant DOM implementation
        if (!W3CDOM){return false};

        var tool = window.onbeforeunload && window.onbeforeunload.tool;
        var content = getContentArea();
        if (tool && content) {
            var forms = cssQuery('form.enableUnloadProtection');
            for (var i=0; i < forms.length; i++) {
                tool.addForm(forms[i]);
            }
        }
    });
})();