[SELF RESOLVED] Script Timing out

why does this code keep timing out?

PHP Code:

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function getStep($u){
    $sql1 = "SELECT Step FROM tblUsers WHERE User_ID=$u";
    $res1 = mysql_query($sql1) or die("An error has occured<br>".mysql_error());
        if(mysql_num_rows($res1) > 0){
         while($ro_w = mysql_num_rows($res1)){
         $ms = kill_null($ro_w['Step'], 0);
         }
        } else {
         $ms = "-1";
        }
         return $ms;
} 


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i figured it out; i used the function mysql_num_rows instead of mysql_fetch_array on line 5

PHP Code:

---

function getStep($u){ 
    $sql1 = "SELECT Step FROM tblUsers WHERE User_ID=$u"; 
    $res1 = mysql_query($sql1) or die("An error has occured<br>".mysql_error()); 
        if(mysql_num_rows($res1) > 0){ 
         while($ro_w = mysql_num_rows($res1)){ //instead of mysql_num_rows
         $ms = kill_null($ro_w['Step'], 0); 
         } 
        } else { 
         $ms = "-1"; 
        } 
         return $ms; 
} 


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and i can't beleive i cross checked this code times