Sessions within new windows

Hi, Not sure if this is a PHP or Browser issue but here is my problem: I have a site that has a members section. In the news area, when a user clicks the link for an article, it pops open a new window a requests the article via a PHP script. What's happening is that when the new window pops up, the script isn't getting the session info properly. I changed it so that the page opens up in the main window instead of a new one and it works fine. I presume this is because the browser is not sending the session ID to the script when opening the new window. Does anyone know of a way for me to fix this without embedding the session ID in the URL? I thought the only criteria that the browser used when deciding if to send a Session ID or not was if the page is located at the same domain name. P.S. Its Internet Explorer 6 I am using. Thanks.