/*
 *
 * Copyright (c) 2007, RightNow Technologies, Inc
 *
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 * -	Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * -	Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 * -	Neither the name of the RightNow Technologies nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

var RNTFeed = {
	readers : null,
	rnt_ids : 0,
	callBack : null,
	onloadCallback : function (call){
		RNTFeed.callBack = call;
	},
	init: function (){
		if(RNTFeed.callBack)
			RNTFeed.callBack();
	},
	getReader : function(){
		var id = RNTFeed.rnt_ids++;
		var reader = new RNTReader();
		reader.id = id;

		if (!this.readers){
 			RNTFeed.readers = new Object();
 		}
		RNTFeed.readers[id] = reader;
		return reader;
	},
	getRSS:function(id){
		var feed = RNTFeed.readers[id];
		if(feed){
			feed.search();
		}
	},
	next:function(id){
		feed = RNTFeed.readers[id];
		feed.next();
	},
	prev:function(id){
		feed = RNTFeed.readers[id];
		feed.prev();
	},
	getRelated:function(id, searchTerms){
		var feed = RNTFeed.readers[id];
		if(feed.searchbox=='on' && searchTerms != '1234qwerasdfzxcv'){
			feed.form.input.value = searchTerms;
		}
		feed.query = searchTerms;
		feed.getRSS();
	}
};

RNTFeed.div = function(clazz, id){
	var divElement = document.createElement("div");
	if(clazz){
		divElement.className = clazz;
	}
	if(id){
		divElement.id = id;
	}
	return divElement;
}

RNTFeed.table = function(space, pad, clazz){
	var element = document.createElement("table");
	element.setAttribute("cellSpacing", space?space:0);
	element.setAttribute("cellPadding", pad?pad:0);
	if(clazz){
		element.className = clazz
	}
	return element;
}

RNTFeed.row = function(table, n, clazz){
	var row = table.insertRow(-1);
	for(var i= 0; i < n;i++){
		RNTFeed.cell(row, clazz);
	}
	return row;
}

RNTFeed.cell = function(row, clazz){
	var cell = row.insertCell(-1);
	if(clazz)
	{
		cell.className = clazz
	}
	return cell;
}

RNTFeed.createButton = function(value, clazz, title){
	var input = document.createElement("input");
	input.type = "submit";
	input.value = value;
	input.title = title;
	input.name = value;

	if(clazz){
		input.className = clazz;
	}
	return input;
}

RNTFeed.createInput = function(value){
	var input = document.createElement("input");
	input.setAttribute("autoComplete","on");
	input.type = "text";
	if(value)
		input.value = value;
	return input;
}

RNTFeed.createForm = function(clazz, id){
	var form = document.createElement("form");
	form.className = clazz
	form.style.marginBottom = ".75em";
	if(id){
		form.id = id;
	}
	return form;
}

RNTFeed.SearchForm = function (root, id, query){
	var form = RNTFeed.createForm("rn_form", "faq_widget_form");
	form.action = "javascript:RNTFeed.getRSS("+id+")";

	this.searchButton = RNTFeed.createButton("Search", "primary_action", "RSS Search");
	this.searchButton.title = "RSS Search";

	this.input = RNTFeed.createInput(query);
	this.input.name = "q";
	this.input.id = "rn_q";

	this.l = RNTFeed.div('rn_label','rn_label');
	this.l.innerHTML = '<label for="rn_q" style="font-size:90%;"><strong>Search FAQs by Keyword:</strong></label>';

	var t = RNTFeed.table(0,0,"searcformtable");
	RNTFeed.appendChild(form, t);
	var r = RNTFeed.row(t, 0);
	var lab = RNTFeed.cell(r, "searchlabel");

	r = RNTFeed.row(t, 0);
	var input = RNTFeed.cell(r, "searchinput");
	var search = RNTFeed.cell(r, "searchbutton");

	RNTFeed.appendChild(lab, this.l);
	RNTFeed.appendChild(input, this.input);
	RNTFeed.appendChild(search, this.searchButton);
	RNTFeed.appendChild(root, form);
}

RNTFeed.NavigationForm = function (root, id){
	var form = RNTFeed.createForm("navigationform", "navigationform");
	form.action = "javascript:void(0)";

	this.prevButton = RNTFeed.createButton("<<Back", "prevBtn", "Previous Page");
	this.prevButton.onclick = function(){RNTFeed.prev(id);};
	this.nextButton = RNTFeed.createButton("Next>>", "nextBtn", "Next Page");
	this.nextButton.onclick = function(){RNTFeed.next(id);};

	var t = RNTFeed.table(0,2,"navigationtable");
	RNTFeed.appendChild(form, t);
	var r = RNTFeed.row(t, 0);
	var prev = RNTFeed.cell(r, "prevButton");
	var next = RNTFeed.cell(r, "nextButton");
	RNTFeed.appendChild(prev, this.prevButton);
	RNTFeed.appendChild(next, this.nextButton);

	this.navigation = RNTFeed.div("navigation", "navigation");

	RNTFeed.appendChild(this.navigation, form);
	RNTFeed.appendChild(root, this.navigation);
}

RNTFeed.appendChild = function(root,child){
	root.appendChild(child)
	return child
};

RNTFeed.RNT_ajaxCall = function(url, id, page_next){
 	var handler = RNTFeed.readers[id];
	Ajax.Responders.register({
		onException:handler.handleException,
		onCreate: function(request){
			handler.timeoutId = window.setTimeout(function(){
				if (request.transport.readyState==1 ||
					request.transport.readyState==2	||
					request.transport.readyState==3){
					request.transport.abort();

					handler.handleTimeout();
				}
			}, handler.TIMEOUT);
		},
		onComplete: function(request){
			window.clearTimeout(handler.timeoutId);
		},
		onException:handler.handleException
	});
	function process(response){
		if (response.readyState == 4 && response.status == 200)
		{
			if (response.responseXML != null){
				if(page_next == 1){
					RNT_processChannel(handler, response.responseXML, false);
				}else{
					handler.page = 1;
					RNT_processChannel(handler, response.responseXML, true);
				}
			}else{
 				handler.status = 'ERROR';
				handler.errorMessage = "Failed to receive RSS feed from the server.";
			}
		}else{
			handler.status = 'ERROR';
			handler.errorMessage = 	"Error code " + response.status + " received: " + response.statusText;
		}
		handler.onFeedReady();
	}

 	new Ajax.Request(url, {method:'get', onSuccess:process, onFailure:handler.handleFailure, onException:handler.handleException});
};

RNTFeed.JSONCall = function(url, id, page_next){
	var handler = RNTFeed.readers[id];
	var head = document.getElementsByTagName("head").item(0);
	var script = document.createElement("script");
	RNTFeed.readers[id].onCompleteJSON = function (channel){
		if (Prototype.Browser.Gecko){ //IE crashes: A cleaner solution to be provided.
 			head.removeChild(script);
 		}
		if(page_next == 1)
			handler.channel.item = handler.channel.item.concat(channel.item);
 		else
			handler.channel = channel;
		handler.onFeedReady();
		return true;
	}
	script.setAttribute("type", "text/javascript");
	script.setAttribute("src", url+"&callback=RNTFeed.readers["+id+"].onCompleteJSON");
	head.appendChild(script);
};

function RNTReader(){
	this.uri = 'opensearch.php?';
	this.status = 'SUCCESS';
	this.errorMessage = null;
	this.searchbox = 'off';
	this.navigation = 'off';
	this.pagesize = 20;
	this.page = 1;
	this.query = "";
	this.channel = null;
	this.format = 'xml';
	this.proxy = null;
	this.TIMEOUT = 20000;
	this.timeoutId = null;
	this.root = null;
	this.allLink = 'off';
}

RNTReader.prototype.setQuery = function(parm){
	var q = this.getQuery("q");
	if (typeof parm != 'undefined' && parm != ""){
		this.query = parm;
		if(this.searchbox=='on' && parm != '1234qwerasdfzxcv')
 			this.form.input.value = parm;
	}else if (this.form && this.form.input.value != "" && this.form.input.value != '1234qwerasdfzxcv'){
		this.query = this.form.input.value;
	}else if(q != null){
		this.query = q;
		if(this.searchbox=='on' && q != '1234qwerasdfzxcv')
 			this.form.input.value = q;
	}
};

RNTReader.prototype.search = function(parm){
	this.setQuery(parm);
	this.getRSS();
};

RNTReader.prototype.render = function(divTag){
	this.root = document.getElementById(divTag);

 	if(this.searchbox=='on'){
 		this.form = new RNTFeed.SearchForm(this.root, this.id, this.query);
 	}

 	this.feedHeader = RNTFeed.div("feedHeader", "feedHeader");
 	RNTFeed.appendChild(this.root, this.feedHeader);

 	this.correction = RNTFeed.div("correction", "correction");
 	RNTFeed.appendChild(this.root, this.correction);

 	this.related = RNTFeed.div("related", "related");
 	RNTFeed.appendChild(this.root, this.related);

 	this.topics = RNTFeed.div("topics", "topics");
 	RNTFeed.appendChild(this.root, this.topics);

 	this.feedContent = RNTFeed.div("feedContent", "feedContent");
 	RNTFeed.appendChild(this.root, this.feedContent);

 	this.navigationForm = new RNTFeed.NavigationForm(this.root, this.id);
 	this.navigationForm.navigation.style.display = "none";

	if (this.allLink == 'on'){
		this.rnLink = RNTFeed.div("rnl", "rnl");
		this.rnLink.innerHTML = '<p><a href="http://energystar.custhelp.com/cgi-bin/energystar.cfg/php/enduser/std_alp.php">All FAQs</a></p>';
		RNTFeed.appendChild(this.root, this.rnLink);
	}
};

RNTReader.prototype.getQuery = function(name){
	name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	var regexS = "[\\?&]"+name+"=([^&#]*)";
	var regex = new RegExp(regexS);
	var results = regex.exec(window.location.href);
	if( results == null )
		return null;
	else
		return results[1];
};

RNTReader.prototype.getRSS = function(){
	this.status= 'SUCCESS';
	var url = this.uri;

	var ln = url.length;

	if(url.charAt(ln-1)== '?' || url.charAt(ln-1)== '&' )
		url += 'startIndex='+0+'&count='+this.pagesize;
	else
		url += '&startIndex='+0+'&count='+this.pagesize;

	if(this.query != null && this.query != "")
		url += '&q='+escape(this.query);

	if(this.format == "json" || this.proxy == null){
		this.page = 1;
		url += '&format=json';
		RNTFeed.JSONCall(url, this.id, 0);
	}else{
		if(this.proxy){
			url = this.proxy+"?url="+escape(url);
		}
		RNTFeed.RNT_ajaxCall(url, this.id, 0);
	}
};

RNTReader.prototype.next = function(){
	this.page++;
 	var pStart = (this.page-1)*this.pagesize;

 	if(pStart >= this.channel.item.length){
		var url = this.uri;
 		var ln = url.length;

 		if(url.charAt(ln-1)== '?' || url.charAt(ln-1)== '&' )
 			url += 'startIndex='+pStart+'&count='+this.pagesize;
 		else
 			url += '&startIndex='+pStart+'&count='+this.pagesize;

 		if(this.format == "json" || this.proxy == null){
 			url += '&format=json';
 			RNTFeed.JSONCall(url, this.id, 1);
 		}else{
 			if(this.proxy){
 				url = this.proxy+"?url="+escape(url);
 			}
 			RNTFeed.RNT_ajaxCall(url, this.id, 1);
 		}
	}else{
 		this.onFeedReady();
 	}
};

RNTReader.prototype.prev = function(){
	this.page--;
	this.onFeedReady();
};

RNTReader.prototype.trimStr = function(str){
	if(str == null)
		return null;
	return str.replace(/^\s*|\s*$/g,'');
};

RNTReader.prototype.getRelated= function(searchTerms){
	if(this.searchbox=='on' && searchTerms != '1234qwerasdfzxcv'){
		tthis.form.input.value = searchTerms;
	}else{
		this.query = searchTerms;
	}
	this.getRSS();
};

RNTReader.prototype.onFeedReady = function(){

	var RSS = this.channel;

	this.correction.style.display="none";
	this.related.style.display="none";
	this.topics.style.display="none";

	if ((typeof RSS == 'undefined' || RSS == null) ||
		((typeof RSS.Query == 'undefined' || RSS.Query == null || RSS.Query.length==0)
		&& (typeof RSS.topic == 'undefined' || RSS.topic == null|| RSS.topic.length==0)
		&& (typeof RSS.item == 'undefined' || RSS.item == null || RSS.item.length==0)) ){
		document.getElementById("topics").style.visibility='hidden';

		this.feedContent.innerHTML = "There are no results for this query. Please try another search";
		return;
	}

	if(this.status == 'ERROR'){
		this.feedContent.innerHTML = this.errorMessage;
		return;
	}

	if (typeof RSS.Query != 'undefined' && RSS.Query != null && RSS.Query.length != 0){
		var correctionHtml = "";
		var relatedHtml = "";
		var c = false;
		var r = false

		for (var i = 0; i < RSS.Query.length; i++){
			var query = RSS.Query[i];
			if(query.role == "correction"){
				if(c){
					correctionHtml += ", <a 	href='#' onclick=\"RNTFeed.getRelated("+this.id+",'"+query.searchTerms+"')\">"+query.searchTerms+"</a>";
				} else {
					correctionHtml += "<a 	href='#' onclick=\"RNTFeed.getRelated("+this.id+",'"+query.searchTerms+"')\">"+query.searchTerms+"</a>";
					c = true;
				}
			}
			if(query.role == "related"){
				if(r){
					relatedHtml += ", <a 	href='#' onclick=\"RNTFeed.getRelated("+this.id+",'"+query.searchTerms+"')\">"+query.searchTerms+"</a>";
				} else {
					relatedHtml += "<a 	href='#' onclick=\"RNTFeed.getRelated("+this.id+",'"+query.searchTerms+"')\">"+query.searchTerms+"</a>";
					r = true;
				}
			}
		}

		if(correctionHtml != ""){
			this.correction.style.display="";
			this.correction.innerHTML = "Did you mean <strong>"+correctionHtml+"</strong>?";
		}
		if(relatedHtml != ""){
			this.related.style.display="";
			this.related.innerHTML = "Related Searches: <strong>"+relatedHtml+"</strong>";
		}
	}

	this.topics.innerHTML = "";
	if (typeof RSS.topic != 'undefined' && RSS.topic != null && RSS.topic.length != 0){
		this.topics.style.display = "";

		var topicStr = '<div id="topicsContent"><b>Recommended Documents:</b>'
		for (var i = 0; i < RSS.topic.length; i++)
		{
			var topic = RSS.topic[i];

			var i_link = this.trimStr(topic.link)
			var i_title = this.trimStr(topic.title);
			var i_description = this.trimStr(topic.description);

			if(i_link != null && i_link != ""){
				topicStr += '<li><a href="'+i_link+'">'+i_title+'</a></li>';
			}

		}
		topicStr += '</div><div class="clearboth"></div>';

		if(RSS.topic.length > 0)
			this.topics.innerHTML += topicStr;
	}else
		this.topics.style.display="none";

	this.feedContent.innerHTML = "";

	//TODO: logic for paging should move to a different function. Header information should not refreshed for each
	//page
	if (typeof RSS.item != 'undefined' && RSS.item != null && RSS.item.length != 0){
		var pStart = (this.page-1)*this.pagesize;
		var pEnd = this.page*this.pagesize;

		if(pEnd > RSS.item.length)
			pEnd = RSS.item.length;

		for (var i = pStart; i < pEnd; i++)
		{
			var item = RSS.item[i];

			var i_link = this.trimStr(item.link)
			var i_title = this.trimStr(item.title);
			var i_description = this.trimStr(item.description);
			var i_image_url = this.trimStr(item.url);

			var itemStr = '<p>'

			if(i_link != null && i_link != ""){
				itemStr += '<a href="'+i_link+'">'+i_title+'</a>';
			}
			if(i_description != null && i_description != ""){
				itemStr += '<div class="itemContent"><p>'+i_description+'</p></div>';
			}

			itemStr += '</p>';
			this.feedContent.innerHTML += itemStr;
		}

		//enable or disable buttons
		//we could also check if itemsPerPage <= pagesize
		if(pEnd < RSS.item.length || pEnd < RSS.totalResults ){
			if(this.navigation=='on'){
				this.navigationForm.navigation.style.display = "block";
			}

			this.navigationForm.nextButton.disabled = false;
		}
		else //if not this pagination
		{
			this.navigationForm.nextButton.disabled = true;
		}

		if(this.page > 1){
			this.navigationForm.prevButton.disabled= false;

		}
		else {
			this.navigationForm.prevButton.disabled= true;
		}
	}else{
		this.navigationForm.navigation.style.display="none";
		this.navigationForm.nextButton.disabled = true;
		this.navigationForm.prevButton.disabled = true;
	}
};

RNTReader.prototype.handleFailure = function(o){
	this.status = 'ERROR';
	this.errorMessage = "Failed to request RSS feed from the server";
	this.feedContent.innerHTML = this.errorMessage;
};

RNTReader.prototype.handleException = function(o, exception){
	this.status = 'ERROR';
	this.errorMessage = "Failed to receive RSS feed from the server: <font color=red>"+exception+"</font>";
	this.feedContent.innerHTML = this.errorMessage;
};

RNTReader.prototype.handleTimeout = function(){
	this.status = 'ERROR';
	this.errorMessage = "Call to server didn't return. Make sure you have appropriate timeout set";
	this.feedContent.innerHTML = this.errorMessage;
};

window.onload = RNTFeed.init;

/*
 * RNT RSS Parser
 *
 *
 */
function RNT_processChannel(handler, rssDom, newSearch){
	var channel = null;
	var cElement = rssDom.getElementsByTagName("channel")[0];

	if(newSearch)
		handler.channel = new RNT_Channel(rssDom);

	var itemList = rssDom.getElementsByTagName("item");
	for (var i = 0; i < itemList.length; i++)
	{
		var item = new RNT_Item(itemList[i]);
		handler.channel.item.push(item);
	}
	//Firefox bug:https://bugzilla.mozilla.org/show_bug.cgi?id=206053
	if (Prototype.Browser.Gecko){
		handler.channel.totalResults = RNT_elementValue(rssDom, 'totalResults') ? RNT_elementValue(rssDom, 'totalResults'):itemList.length;
		handler.channel.startIndex = RNT_elementValue(rssDom, 'startIndex') ? RNT_elementValue(rssDom, 'startIndex') :0;
		handler.channel.itemsPerPage = RNT_elementValue(rssDom, 'itemsPerPage') ? RNT_elementValue(rssDom, 'itemsPerPage'):itemList.length;
	}else{
		handler.channel.totalResults = RNT_elementValue(rssDom, 'opensearch:totalResults') ? RNT_elementValue(rssDom, 'opensearch:totalResults'):itemList.length;
		handler.channel.startIndex =	RNT_elementValue(rssDom, 'opensearch:startIndex') ? RNT_elementValue(rssDom, 'opensearch:startIndex') :0;
		handler.channel.itemsPerPage = RNT_elementValue(rssDom, 'opensearch:itemsPerPage') ? RNT_elementValue(rssDom, 'opensearch:itemsPerPage'):itemList.length;
	}
}

function RNT_Channel(rssDom)
{
	var cElement = rssDom.getElementsByTagName("channel")[0];

	//required channel elements
	this.title = RNT_elementValue(cElement, 'title');
	this.link = RNT_elementValue(cElement, 'link');
	this.description = RNT_elementValue(cElement, 'description');

	//optional elements
	this.language = RNT_elementValue(cElement, 'language');
	this.copyright = RNT_elementValue(cElement, 'copyright');
	this.managingEditor = RNT_elementValue(cElement, 'managingEditor');
	this.webMaster = RNT_elementValue(cElement, 'webMaster');
	this.pubDate = RNT_elementValue(cElement, 'pubDate');
	this.lastBuildDate = RNT_elementValue(cElement, 'lastBuildDate');
	this.generator = RNT_elementValue(cElement, 'generator');

	this.Query = new Array();
	this.topic = new Array();

	var queryList = null;
	//Firefox bug:https://bugzilla.mozilla.org/show_bug.cgi?id=206053
	if (Prototype.Browser.Gecko){
		queryList = cElement.getElementsByTagName("Query");
	}else{
		queryList = cElement.getElementsByTagName("opensearch:Query");
	}

	for (var i = 0; i < queryList.length; i++)
	{
		var query = new RNT_Query(queryList[i]);
		this.Query.push(query);
	}

	this.category = new Array();
	var children = cElement.childNodes;

	for(var i = 0; i < children.length; i++) {
		var childElement = children[i];
		if(childElement.tagName =="category"){
			var cat = new RNT_Category(childElement);
			this.category.push(cat);
		}
	}
	//HT: IE requires namespace
	var topicList = null;
	//Firefox bug:https://bugzilla.mozilla.org/show_bug.cgi?id=206053
	if (Prototype.Browser.Gecko){
		topicList = cElement.getElementsByTagName("topic");
	}else{
		topicList = cElement.getElementsByTagName("related:topic");
	}

	for (var i = 0; i < topicList.length; i++)
	{
		var topic = new RNT_Topic(topicList[i]);
		this.topic.push(topic);
	}

	this.docs = RNT_elementValue(cElement, 'docs');
	this.ttl = RNT_elementValue(cElement, 'ttl');
	this.image = new RNT_Image(cElement.getElementsByTagName("image")[0]);
	this.rating = RNT_elementValue(cElement, 'rating');

	//just for completeness: no need for these elements in order to view
	this.skipHours = RNT_elementValue(cElement, 'skipHours');
	this.skipDays = RNT_elementValue(cElement, 'skipDays');

	//items
	this.item = new Array();
}

//if tag is defined returns the value of the element in dom.
//else it returns the value of element
function RNT_elementValue(dom, tag)
{
	if (dom == null || (typeof dom == 'undefined'))
		return null;

	if (typeof tag == 'undefined' ) element = dom;
	else
		element = dom.getElementsByTagName(tag)[0];

	if(element == null || (typeof element == 'undefined'))
		return null;
	else{
		if(element.childNodes.length > 0)
			return element.childNodes[0].nodeValue;
		else
			return "";
	}
}

function RNT_getAttr(element, attribute)
{
	if(element == null)
		return null;
	else
		return element.getAttribute(attribute);
}

function RNT_Item(element)
{
	//All elements of an item are optional, however at least one of title or description must be present.
	this.title = RNT_elementValue(element, 'title');
	this.link = RNT_elementValue(element, 'link');
	this.description = RNT_elementValue(element, 'description');
	this.author = RNT_elementValue(element, 'author');

	//this.category = new Category(cElement.getElementsByTagName("category")[0]);

	this.category = new Array();
	var categoryList = element.getElementsByTagName("category");
	for (var i = 0; i < categoryList.length; i++)
	{
		var cat = new RNT_Category(categoryList[i]);
		this.category.push(cat);
	}

	//this.category	= new Category(element.getElementsByTagName("category")[0]);

	this.comments = RNT_elementValue(element, 'comments');
	this.enclosure = new RNT_Enclosure(element.getElementsByTagName("enclosure")[0]);
	this.guid = new RNT_Guid(element.getElementsByTagName("guid")[0]);
	this.pubDate = RNT_elementValue(element, 'pubDate');
	this.source = new RNT_Source(element.getElementsByTagName("source")[0]);
}

//Describes a media object that is attached to the item.
function RNT_Enclosure(element)
{
		this.url = RNT_getAttr(element, "url");
		this.length = RNT_getAttr(element, "length");
		this.type = RNT_getAttr(element, "type");
}

function RNT_Guid(element)
{
	this.isPermaLink = RNT_getAttr(element, "isPermaLink");
	this.value = RNT_elementValue(element);
}

//The RSS channel that the item came from
function RNT_Source(element)
{
	this.url = RNT_getAttr(element, "url");
	this.value = RNT_elementValue(element);
}

//categorization taxonomy
function RNT_Category(element)
{
	this.domain = RNT_getAttr(element, "domain");
	this.value = RNT_elementValue(element);
}

function RNT_Image(element)
{
	this.url = RNT_elementValue(element, "url");
	this.link = RNT_elementValue(element, "link");
	this.width = RNT_elementValue(element, "width");
	this.height = RNT_elementValue(element, "height");
	this.description = RNT_elementValue(element, "description");
}

//OpenSearch element
function RNT_Query(element)
{
	this.role = RNT_getAttr(element, "role");
	this.title = RNT_getAttr(element, "title");
	this.searchTerms = RNT_getAttr(element, "searchTerms");
}

//RNT extension
function RNT_Topic(element)
{
	this.title = RNT_elementValue(element, 'title');
	this.link = RNT_elementValue(element, 'link');
	this.description = RNT_elementValue(element, 'description');
}