cookies and iframes and php, oh my

[phpman]

here is a good one. I have a page called say something.html

in this page is a iframe calling a php script from a different site.

like so

http://www.differentsite.com/php/sho...p&bg=%23FFFFFF

and in that shop2.php is a setcookie() function

$cookietimeout = time()+(3600*24*365);
if($_GET["partner"]){
    $value = $_GET["partner"];
    setcookie("REFERRALCOOKIE",$value,$cookietimeout); 

now here is the question. the cookie works for all browsers except IE. can anybody tell me why it doesn't work for IE. I have IE 6 too.

the cookie just doesn't get set.