Functionally disable Back button?

[wxdqz]

I am running Javascript with ASP accessing a SQL 7. What I need to do is make it so that when the user hits the back button, either it goes to a blank page or goes to some default page.

Something like PayPal does when you are making a payment and it says that the page has expired when you hit the back button.

Thanks in advance for any help with this problem.

Will Summers