<public:attach event="onmouseover" onevent="aover()" />
<public:attach event="onmouseout" onevent="aout()" />

<script language="javascript">
function aover()
{
aaa=this.style.backgroundColor;
this.style.backgroundColor='#eeeeee';
}

function aout()
{
this.style.backgroundColor=aaa;
}
</script>