Multiple mysql select boxes question

[mac4281]

I have a site i've done in wordpress with multiple select boxes loaded from the database. How would i take the selected options from the select boxes and send the user to the corresponding url?? The select boxes are not chained or connected at all. Do they need to be to achieve this? Might be a dumb question but I'm a rookie. Thanks

heres what i have so far (2 instances of this)

<?php
$sql = "SELECT * FROM `product_categories` WHERE `name`";

$rs = mysql_query($sql);

while($row = mysql_fetch_array($rs))
{
  echo "<option value=\"".$row['name']."\">".$row['name']."\n  ";
}
?>