http://learn.javascript.ru/play/UMFrec
<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
table td {
border: 1px solid #333;
height: 50px;
width: 300px;
}
table tr:hover, table tr:hover + tr {
background: yellow;
}
</style>
</head>
<body>
<table>
<tbody>
<tr>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td>2</td>
</tr>
<tr>
<td>3</td>
<td>3</td>
</tr>
<tr>
<td>4</td>
<td>4</td>
</tr>
<tr>
<td>5</td>
<td>5</td>
</tr>
</tbody>
</table>
</body>
</html>