this code is not working????

[MDanz]

it says this error..  Warning: Division by zero in ..

 

the variables are correct, so why is the variable $max zero??/

 $sw = $_GET['w'];
 $sh = $_GET['h'];



  	if("$swx$sh" =="1024x768") {
   $max = 9;
}elseif("$swx$sh" =="1440x900") {
   $max = 14;
}

         
            $run = mysql_query($recent);
            $foundnum = mysql_num_rows(mysql_query($recent));
            $row_count = ceil($total / $max);

   
            $row_count = ceil($foundnum / $max);

[LeadingWebDev]

$wh = $sw."x".$sh;

if($wh =="1024x768") {

  $max = 9;

}elseif($wh =="1440x900") {

  $max = 14;

}