It looks like your edoc.php page posts to an iframe that then redirects back to the products_detail.php page. Do you see the products_detail.php page at that point?
I'm afraid this is probably too complex for me to debug in this forum. You will need to sign up for a premier support ticket and we will have to work over the phone with screen sharing so that I can figure out how it is supposed to work and fix whatever problems you are having.