quickform problem

I have got a PHP script which the user will trigger from a link like http://www.blablabla.nl?VARIABLE=value in the script i will retrieve the value with $_GET['VARIABLE']; so far so good immediately after that I define a quickform, fill it with some data from the database (depending on the value of the variable) then when I do a form->validate(), which is being processed after the user presses the submit button, it will always try to do the $_GET['VARIABLE'] again, even if I use some Javascript to navigate to a different page The navigation works... but first I get an error message on the $_GET After the user has done the submit I don't want that form anymore, I want a different page I really don't get the flow of execution, forgive me... I am quite new to this