calling a random image, without img tag?

Hello!

My index page’s background image is defined by the latest post’s content (which is a naked link to an uploaded image, nothing else). This is how I call it :

<div id="content" style="background-image:url(<?php echo get_the_content(); ?>)">

I’d love to be able to have different images load randomly, so that upon each visit, my visitors would get a chance to see a different picture. I haven’t been able to find a plug-in that would do that.

Plug-ins for random posts add all kinds of info (like the title… etc) and plug-ins for random images add the <img> tag. I tried Random File, but it didn’t work.

Anybody has a suggestion?

Thanks!