это в голове
<script language="javascript">
<!--
var loaded = 0;
function loadimg() {
if(document.images){
im=new Array(); im2=new Array();
im[3]=new Image; im[3].src="images/mn_27.gif";
loaded = 1;
}
}
loadimg();
//-->
</script>
а это в кнопке
<a href="#" class="mmenu" onMouseOut="images['m3'].src = im[3].src" onMouseOver="images['m3'].src = im2[3].src"><img src="images/mn_27.gif" width="173" height="16" border=0 alt="" name=m3></a>