How to make vB redirect?

[Cold Steel]

How do I make a simple thankyou page (using vB header/footer) that will redirect users back to the page they were originally on?

I plan on putting a PostMasterDirect form on my vB pages, and after they sign up I'd like for them to be taken to a short thankyou page (much like the thankyou page you get when you register) and then redirected back to the page they were originally on.

Is this possible?

And if so, how is it done?

Thanks!