I want to show and hide rows of a table based on the value of a select box and this works in Firefox but not IE:

<select onChange="javascript: toggle(this.value);">
 <option value="cat0">category 0</option>
 <option value="cat1">category 1</option>
</select>

<table>
<tr name="cat0">
  <td>some stuff v</td>
  <td>some stuff v</td>
</tr>
<tr name="cat0">
  <td>some stuff d</td>
  <td>some stuff d</td>
</tr>
<tr name="cat1">
  <td>some stuff a</td>
  <td>some stuff a</td>
</tr>
<tr name="cat1">
  <td>some stuff b</td>
  <td>some stuff b</td>
</tr>
</table>
<script type="text/javascript">
function toggle(category)
{
    // turn everything off
    for (var i = 0; i < 2; i++)
    {
        var cat = document.getElementsByName('cat' + i);
        for (var j = 0; j < cat.length; j++)
            cat[j].style.display = 'none';
    }

    // turn on category chosen
    var cat = document.getElementsByName(category);
    for (var i = 0; i < cat.length; i++)
        cat[i].style.display = '';
}
// start by showing cat0
toggle('cat0');
</script>