V tabuľke zvýrazniť riadok po prejdení myšou

<script language=JavaScript>
<!--
function select (row){
row.style.background = '#dbdbdb';
}
function deselect (row){
row.style.background = 'none';
}
// -->
</script>

<table border=1>
  <tr onmouseover='select(this);' onmouseout='deselect(this);'>
    <td>Bunka 1
    <td>Bunka 2
  <tr onmouseover='select(this);' onmouseout='deselect(this);'>
    <td>Bunka 3
    <td>Bunka 4
</table>