It can be done both server and client side, since your client experiences it visits index.php and not the required file.What I mean is, the client/webbrowsers url is the one the form should use, because requiring a file in php makes the file just extend the information. So the client experices it as if it only had been one file all along. Therefor not specifying action will submit to the correct page as I tried to explain before.The only problem is you dont allow it in your xhtml 1.1 standard for What reason? :SThats why Im suggesting that you add a feature for this in new standards. I mean I cant see any down sides with it. If there are tell me plz....