Domain Masking is canceling my php session variables

K so i have a php script, here it is minus the database info

<?PHP
session_start();
//require_once($_SERVER['DOCUMENT_ROOT'] . "/include/database.class.php");

//require("/home//public_html/include/database.class.php");

$username_lookup = rtrim($_SERVER['REDIRECT_URL'],'/');
preg_match('/\/[A-Za-z0-9_\- ]+$/', $_SERVER['REDIRECT_URL'], $matches);
$username_lookup = substr(trim($matches[0]),1);

if($username_lookup){
      //$db = new database();
      //$db = new database();
      //$db = new database();
      
      $ho =
   $us =
   $pa =
   $dbName =

   // connect and select the database
   $conn = mysql_connect($ho, $us, $pa) or die(mysql_error());
   $db = mysql_select_db($dbName, $conn) or die(mysql_error());
      //$db = new database

      unset($_SESSION["user"]);
$a = 1;
$b = 5;
      
      if($a<$b){
            $_SESSION["user"]["username"] = strtolower($username_lookup);
      }
      
      if($username_lookup == 'clearsession'){
            unset($_SESSION["user"]);
      }
}

if(!$_SESSION["user"]["username"]){
      header("Location: /real404.php");
}else{
      //header("Location: /index.php");
      include('index.php');
}

echo "<!--" . @$_SESSION["user"]["username"] . "-->";
?>


Basically it uses a 404 error when someone types in a web address say www.cool.com/4356 it searches the database to see if there is a 4356 and displays it as a replicated site if there is and returns a 404 error if it doesnt.  Everything works great.  People can put links into their site as well say www.cool.com/4356 .   Problem is people are getting there own domain names say www.irock.com and forward it with domain masking to www.cool.com/4356 .  In firefox it works fine but in IE it is not setting the session variables.  Has anyone heard of this bug before or any way around it?Start Free Trial