How can i create a combobox ?

<!–code for combobox creation–>

<tr>

<td>Category:</td>

<td>

<select name=”category” id=”category” maxlength=”100″>

<option value=” “>–select category–</option>

<?php $s2=”select * from category “;

$q2=mysql_query($s2);

while($rw2=mysql_fetch_array($q2)) {

?>

<option value=”<?php echo $rw2[‘id’]; ?>”><?php echo $rw2[‘category’]; ?></option><?php } ?>

</select>

</td>

</tr>