  body:

<script language="JavaScript">
if (document.images) {       
img1on = new Image();		
img1on.src ="http://fantasyflash.ru/avatar/ava_cat/image/cat15.jpg"; 
img1off = new Image();		  	
img1off.src = "http://fantasyflash.ru/avatar/ava_cat/image/cat14.jpg"; 
}
function imgOn(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "on.src"); }}//osw
function imgOff(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "off.src"); }}
</script>
<a href="http://fantasyflash.ru" onmouseover="imgOn('img1')"; onmouseout="imgOff('img1')" >
<img src="http://fantasyflash.ru/avatar/ava_cat/image/cat15.jpg" border="0" name=img1></a>
</center>