What about some javascript then?
.....................................
<HTML>
<HEAD>
<TITLE></TITLE>
<SCRIPT type="text/javascript" language="javascript">
<!--
// preload
if (document.images) {
hide_pic = new Image(xx,yy); hide_pic.src = "transparent.gif";
show_pic = new Image(xx,yy); show_pic.src = "YourImage.gif";
}
function hideShow(imgName,imgObjName) {
if (document.images) {
document.images[imgName].src = eval(imgObjName + ".src");
}}
//-->
</SCRIPT>
</HEAD>
<BODY>
<A href="" onMouseOver="hideShow('img01','show_pic')" onMouseOut="hideShow('img01','hide_pic')">
Show the picture
</A>
<BR><BR><BR>
<IMG src="transparent.gif" width="137" height="xx" border="yy" name=img01>
</BODY>
</HTML>
.....................................
yourimage.gif = the image you want to show (and the path to it)
transparent.gif = a 1*1 pixel transparent gif used when the image is "hidden"
xx = the image's width
yy= the image's height
Note how "name" is used in the image tag and in the A tag.
The text link can of course as well be an image.