<script language="JavaScript" type="text/JavaScript">
<!--



function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
//-->
</script>
<body onLoad="MM_preloadImages('your_mouse_over_picture_ path.jpg')">
[img]picture_when_no_mouse_over.jpg[/img]