WA_ClearSession not clearing sessions?

I'm sure this was resolved previously, but the following code is not wiping session values. This code is on our checkout_success.php page:

<?php 
@session_start();
if (!isset($_GET['framed'])){
  // WA_ClearSession
	$clearAll = FALSE;
	$clearThese = explode(",","PayPal_ECO_Token,PayPal_ECO_PayerID,eCartSMC_Items,eCartSMC_OrderID,NEWuserID,NEWformID");
	if($clearAll){
		foreach ($_SESSION as $key => $value){
			unset($_SESSION[$key]);
		}
	}
	else{
		foreach($clearThese as $value){
			unset($_SESSION[$value]);
		}
	}
}
?>

After some digging, I found (http://www.webassist.com/forums/posts.php?id=41903) where you'd previously resolved this, by adding this code:

<script>
if (top.location!= self.location || document.location.href.indexOf("?framed=1") >= 0) {
  top.location = self.location.href.replace(/([\?\&])framed=/,"$1unframed=");
}
</script>

...to the checkout_success.php page. However, the sessions are not being wiped, despite this code.
NJ

What is the web site? I'll have to debug it live to determine what the issue is. How do you know it isn't clearing? What session variable is still set and how do you know? It is only set up to delete a few session variables, not the entire session. Maybe you want to change the line to:

$clearAll = TRUE;

It's the last one, NEWformID, although I would assume that if that isn't clearing then, likely, the others aren't either.

Once a user gets to checkout_success.php, and then clicks on the "Get Started" option again - to start a new order - the form is already filled in with all the details from the order that's just completed, because the session value for NEWformID is still active.

Thank you
NJ

I had to start the session before the <!doctype> in order to fix this problem. I just added this:

<?php
@session_start();
?>

right on line 79 and that seems to have resolved this issue.

Much appreciated. Thank you.
NJ