Something

function pc_dropdown() {$query="SELECT name,id FROM category WHERE site = 1";$result = mysql_query ($query);echo "<select name=cattag_1_1 value='' onchange=showUser(this.value)>CatTag 1</option>";while($nt=mysql_fetch_array($result)){echo "<option value=$nt[id]>$nt[name]</option>";}echo "</select>";}