quiz time - why wont this work?

[admin]

if ((!empty($searchrepname))&&(!empty($searchrepnum))){
$searchrepname="%".$searchrepname."%";
$result = mysql_query("SELECT u_repnum,u_repname FROM col_user WHERE (u_repname like '$searchrepname' and u_repnum>='$searchrepnum') group by u_repnum,u_repname order u_repname, u_repnum");}