Using Asp Function For OnSubmit

I recently solved a problem where I had to have a Form Submit cancel if certain forms were not filled out. I used a javascript function in the OnSubmit option.

<form name = "myform" method="POST" action="goto.asp" onSubmit = "return test()">

test() is a javascript function. It returned false and cancled the form submit if two radio buttons enclosed in the form were not checked. Using a asp function would be more elegant if possible. Has anyone made the Onsubmit function work with an asp function?