如何使用Flash执行的php脚本设置cookie？

I have a flash upload script, that uses a .php file as the processor. I need the processor file to set a cookie with a gallery ID that was created by php script, and pass it on to the confirmation page. Except when Flash runs the php file... it doesnt set the cookie. It does set the session variable, which was good enough, but now Im using lighttpd for the site (including the confirmation page) and apache for the actual uploader processor script (because lighttps sucks at uploading large files), so the session vars don't get transferred between the 2 server software. I have a flash upload script, that uses a .php