Trying to Parse Only the Images from an RSS Feed

First, I am a php newbie. I have looked at the question and solution here. For my needs however, the parsing does not go deep enough into the various articles.

A small sampling of my rss feed reads like this:

 <channel>
 <atom:link href="http://mywebsite.com/rss" rel="self" type="application/rss+xml" />
 <title>My Web Site</title>
 <description>My Feed</description>
 <link>http://mywebsite.com/</link>

 <image>
 <url>http://mywebsite.com/views/images/banner.jpg</url>
 <title>My Title</title>
 <link>http://mywebsite.com/</link>
 <description>Visit My Site</description>
 </image>

 <item>
 <title>Article One</title>
 <guid isPermaLink="true">http://mywebsite.com/details/e8c5106</guid>
 <link>http://mywebsite.com/geturl/e8c5106</link>
 <comments>http://mywebsite.com/details/e8c5106#comments</comments>     
 <pubDate>Wed, 09 Jan 2013 02:59:45 -0500</pubDate> 
 <category>Category 1</category>    
 <description>
      <![CDATA[<div>
      <img src="http://mywebsite.com/myimages/1521197-main.jpg" width="120" border="0"  />  
      <ul><li>Poster: someone's name;</li>
      <li>PostDate: Tue, 08 Jan 2013 21:49:35 -0500</li>
      <li>Rating: 5</li>
      <li>Summary:Lorem ipsum dolor </li></ul></div><div style="clear:both;">]]>
      </description>
 </item> 
 <item>..

The image links that I want to parse out are the ones way inside each Item > Description

The code in my php file reads:

     <?php
 $xml = simplexml_load_file('http://mywebsite.com/rss?t=2040&dl=1&i=1&r=ceddfb43483437b1ed08ab8a72cbc3d5');
 $imgs = $xml->xpath('/item/description/img');
 foreach($imgs as $image) {
      echo $image->src;
 }
 ?>

Can someone please help me figure out how to configure the php code above?

Also a very newbie question... once I get the resulting image urls, how can I display the images in a row on my html?

Many thanks!!!

Hernando