Interesting, yet goofy behavior

Let's say I have a form and the action is thus; <form name=\"managebatch\" action=\"" . basename($PHP_SELF) . "?bid=edit\" method=\"POST\">\n"; Note the 'bid' attribute. Now, I have a case statement in which stuff takes place since the form has called it because of the 'bid' attribute. Before I break from the case I do this; unset($_GET['bid']); SIDEBAR: You should all note that I ma editing someone else's code. Someone who did not bother to comment their code. [ed note: Yes, they work for the same company, but are not in the department, yet management says that I have to support their code. I asked if we could at least teach them commenting and revision control. They looked at me as if I was a space alien]. Someone who believes that all forms should use $PHP_SELF (because whatever book they have showed them this, so therefore it must be good for everything). The URL comes back and the 'bid' attribute is still there. Is this to be expected? If so, do you have any advice (other than copious amounts of alcohol) for dealing with this? Thank you, I really appreciate your help.