I've got a script that I want to prevent people from trying to hack into. It processes an HTML form, I take the input using the param method. The form is freely accessible by everybody, but I want to make sure that the only input the script can get is from the select boxes on the form. How can I prevent people from trying to pass values with the URL, or how can I detect it if it happens, and handle it in the script? Or is ther another way?