question (as if anything else would be in an email to the list...)

Hi again. I have a new problem. I have a form with a drop down list. When the user chooses something from the list, I need a variable to change values so it can be used upon submission of the form. I thought maybe I could throw a little line of code into an onChange() function in the <select > tag, but I got the MS Debugger thrown up on me. Anyone got an idea of how to do this? Is it possible to call a javascript function and change the variable in there? Or an easier way (like inline php code...)? Thanks Jason