form price update with javascript

I notice on many xhtml slicing sites they have a price automatically update based on your selections of how you want it sliced. Can anyone help me with how I would do this? I am working on a form and want to create a similar function.

Thanks

Anyone? I am willing to pay. I just need 4 radio buttons with a combination of 2 displaying a price for the user and have it update as they change combos. jQuery?

Hey, talk to me on AIM and I'll help you out with this. My screename is ohnoesitsraphy