<!DOCTYPE html>
<html>
<head>
<style>
TABLE.highlight {width: 100%; background-color: #F0F0F0;}
TD {border: 1px solid green;}
.light {background-color:red;}
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<table class="highlight">
<tr>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td>3</td>
<td>4</td>
</tr>
</table>
<script>
$(function() {
$(".highlight TD").mouseover(function() {
$(this).parent().addClass("light");
}).mouseout(function(){
$(this).parent().removeClass("light");
});
});
</script>
</body>
</html>
... and it has nothing to do with asp.net, you just need the classes and add this script snippet.