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Pull Image Url From RSS FEED

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I'm using the following code to display to parse an RSS feed via Javascript and Google Feed API into HTML. Is it possible to grab an image from the RSS feed? It is working fine fro the title, snippet, date and link. I just need the URL for the image as well.

    function myGetElementsByClassName(selector) {    if ( document.getElementsByClassName ) {        return document.getElementsByClassName(selector);    }    var returnList = new Array();    var nodes = document.getElementsByTagName('div');    var max = nodes.length;    for ( var i = 0; i < max; i++ ) {        if ( nodes[i].className == selector ) {            returnList[returnList.length] = nodes[i];        }    }    return returnList;}var rssReader = {    containers : null,    // initialization function    init : function(selector) {        containers = myGetElementsByClassName(selector);        for(i=0;i<containers.length;i++){            // getting necessary variables            var rssUrl = containers[i].getAttribute('rss_url');            var num = containers[i].getAttribute('rss_num');            var id = containers[i].getAttribute('id');            // creating temp scripts which will help us to transform XML (RSS) to JSON            var url = encodeURIComponent(rssUrl);            var googUrl = 'https://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num='+num+'&q='+url+'&callback=rssReader.parse&context='+id;            var script = document.createElement('script');            script.setAttribute('type','text/javascript');            script.setAttribute('charset','utf-8');            script.setAttribute('src',googUrl);            containers[i].appendChild(script);        }    },    // parsing of results by google    parse : function(context, data) {        var container = document.getElementById(context);        container.innerHTML = '';        // creating list of elements        var mainList = document.createElement('ul');        // also creating its childs (subitems)        var entries = data.feed.entries;        for (var i=0; i<entries.length; i++) {            var listItem = document.createElement('li');            var title = entries[i].title;            var publishedDate  = entries[i]. publishedDate;            var contentSnippet = entries[i].contentSnippet;            var contentSnippetText = document.createTextNode(contentSnippet);            var mediaGroup = entries[i].mediaGroup;            var link = document.createElement('a');            link.setAttribute('href', entries[i].link);            link.setAttribute('target','_blank');            var text = document.createTextNode(title);            link.appendChild(text);            var text = document.createTextNode(publishedDate);            link.appendChild(text);                var text = document.createTextNode(mediaGroup);            link.appendChild(text);            // add link to list item            listItem.appendChild(link);            var desc = document.createElement('p');            desc.appendChild(contentSnippetText);            // add description to list item            listItem.appendChild(desc);            // adding list item to main list            mainList.appendChild(listItem);        }        container.appendChild(mainList);    }};window.onload = function() {    rssReader.init('post_results');}<div class="post_results" id="post_results2" rss_num="2" rss_url="http://www.feed.com/feed"><div class="loading_rss"><img alt="Loading..." src="images/loading.gif" /></div></div>

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