show table row if select menu equals 1

I have previously used the javascript code below to show / hide a table based a check box:

<script language="javascript">
      $("document").ready(function() {
            if (!$("#phone_support").attr('checked')) $(".captionRow").show();
            $("#phone_support").click(function(){
                  if ($("#phone_support").attr('checked')) $(".captionRow").hide();
                  else $(".captionRow").show();
                  })
            });
</script>

How do I change it so the captionRow class only shows if the value of the below select menu is 1?

<select name="ink_brand_id" id="ink_brand_id">
        <?php
do {  
?>
        <option value="<?php echo $row_rs_ink_brand['id']?>"><?php echo $row_rs_ink_brand['ink_brand']?></option>
        <?php
} while ($row_rs_ink_brand = mysql_fetch_assoc($rs_ink_brand));
  $rows = mysql_num_rows($rs_ink_brand);
  if($rows > 0) {
      mysql_data_seek($rs_ink_brand, 0);
        $row_rs_ink_brand = mysql_fetch_assoc($rs_ink_brand);
  }
?>
      </select>