Here's what i'm using for my images.
<a href="#" onclick="document.getElementById('hdrdiv').className ='hdr1';showitem('toggle1');hideitem('toggle2');hideitem('toggle3');hideitem('toggle4');hideitem('toggle5')"><img src="<?php bloginfo('template_directory'); ?>/contentbg/1black.jpg"></a>
What i'm looking for is something like If class = hdr1, mouseover event