<? ob_start();
   session_start();

   if(!ereg("login.php|signup.php",$_SERVER['PHP_SELF'])) {		
 	 if(strlen(trim($_SESSION['admin_user_name'])) < 1) {		
			echo "<script>this.parent.location.href='login.php';</script>";
			exit();
		}		
	}	
?>