XPATH Get Multiple Values within same Element in an RSS Feed

I have an rss feed that is formatted something like this:

<item><posturl>mysite.com/abc.html</posturl><imagepath>123.jpg</imagepath></item><item><posturl>mysite.com/def.html</posturl><imagepath>456.jpg</imagepath>        </item><item><posturl>mysite.com/ghi.html</posturl><imagepath>789.jpg</imagepath>    </item>

I have a script where I want to extract both the values above. I can extract one of the values and build html code using code like:

<?php     $xml = simplexml_load_file('http://myrssfeed.com');     $imgs = $xml->xpath('//imagepath');            echo '<ul>';         foreach($imgs as $output1) {            echo '<li><img src="' . $output1 . '"></li>';            }            echo '</ul>'; ?>

This works like a charm thanks to all the help from people here. But I need to expand that second echo line to read something like:

echo  '<li><a href="' . $output2 . '"><img src="' . $output1 . '"></a></li>';

I need help on how to extract $output2 = posturl within the same item as $output1.

Basically I need to display the images as links... both imagepath and posturl are elements within item.

Many thanks.