If you use the following code it will work in netscape, IE, mozilla or whatever.
In your header, define the images and a function to swap them
<SCRIPT LANGUAGE="JavaScript1.1">
<!--
{
but0 = new Image();
but0.src = "image1.jpg";
but1 = new Image();
but1.src = "image2.jpg";
}
function changeImage(imgDocID,imgObjName) {
{
document.images[imgDocID].src = eval(imgObjName + ".src");
}
}
-->
</script>
Your HTML code will look like this:
<A HREF="http://www.whatever.com" onmouseover="changeImage('pic','but1')" onmouseout="changeImage('pic','but0')">link text to force change</A>
The image shown here is the one that gets swapped
<IMG BORDER="0" SRC="image1.jpg" ALT="" WIDTH="100" HEIGHT="129" NAME="pic">