Here is my code:

Code:
<script language="javascript">
function show_list(){
var val = document.myform.master.options[document.myform.master.selectedIndex].value;

  if(val==19){ 
  <?
  $sql = 'select * from table where id=19 ORDER BY id ASC'; 
  $res = mysql_query($sql);
  $tot = mysql_num_rows($res);
  for($i=0;$i<$tot;$i++){
    $r = mysql_fetch_array($res);
  ?>
  document.myform2.master.options[<?=$i?>]=new Option("<?=$r[city]?>", <?=$r[id]?>, true, false)
  <? } ?>
  }
}
</script>
The problem is that I´m setting the id value and I dont want to do that.
How can I put the javascript value (val) into this php line below?
sql = 'select * from table where id=19 ORDER BY id ASC';

I´d like something like this:
sql = 'select * from table where id='+val+' ORDER BY id ASC';