FrameSet Problem with PHP, Pls Help!

Dear all I had designed a Index.php, this page is made of different Frames by using UltraDev.The Frame included are Top, Left and Main. In my Left Frame which i used left.php, i had use JavaScript to make a Menu. Top Frame is a Banner and Main is just some content. When i browse preview it, the page just go Perfect! Then Later on. I had a Login.php page which will let user login before they can access my Internal Website. In my Login.php Page, the user will type in the Username and Password, and i had set to post these two var to Index.php. and in Index.php just before the <html> tag, i add a scrpt: <? requrie ("check.php")?> This Check.php is actually the script which will verify the Username and Password passed from Login.php. Once <? requrie ("check.php")?> and add into Index.html, then there is nothing shows up, not even frames, menu or any Banner!! Could someone pls help me with this!! I'm Stuck!!! Thx a lot!! Jack jack@nedcor.com