<style type=text/css>
.a { background-color:#999999;}
.b { background-color:#CCCCCC;}
</style>
<script language=javascript type=text/javascript>
function changeColor(r) {
r.className = (r.className == a) ? r.className=b : r.className=a;
}
</script>
<table align=center width=400px>
<tr id=row_1 class=a onmouseover=changeColor(this) onmouseout=changeColor(this)>
<td width=100%>&nbsp;</td>
</tr>
<tr id=row_2 class=a onmouseover=changeColor(this) onmouseout=changeColor(this)>
<td width=100%>&nbsp;</td>
</tr>
<tr id=row_3 class=a onmouseover=changeColor(this) onmouseout=changeColor(this)>
<td width=100%>&nbsp;</td>
</tr>
<tr id=row_4 class=a onmouseover=changeColor(this) onmouseout=changeColor(this)>
<td width=100%>&nbsp;</td>
</tr>
</table>