<?
...
$subs = mysql_query("select `user` from `subscribers` group by `user`");
...
echo "<td><select>" while ($row = mysql_fetch_assoc($subs)) { "<option value='".$row['user']."'>".$row['user']."</option>" } "</select></td>";
...
?>
echo "<td><select>"; while ($row = mysql_fetch_assoc($subs)) { echo "<option value='".$row['user']."'>".$row['user']."</option>"; } echo "</select></td>";