$maxforonepay = $sonfig_site["ser_per_wmr"]*$user_data["insert_sum"];
if($sum <= $maxforonepay) {
} else echo "<center> <font color='red'> <b> You can't take that much at a time [<a href='./?menu=limit'> Why? </a>]! </b> </center> <BR /> ";
you can delete it