Button click will take me to Page B or Page C

I'm trying to create a script in which a button click on a web page will take me to one of two other web pages. Which web page the button click takes me to depends on an algorithm I have no knowledge of nor do I need to know.



Thus far I've had no success in trying things out for myself, nor can I find what I'm looking for in the Help or online.



My scenario is that I'm on Page A and click the Submit button. Depending on the algorithm this will take me to Page B where I want to do some processing OR to Page C where I want to do some other processing. As it happens a button click on Page B will take me on to Page C.



It would be very much appreciated if someone could point me in the right direction for solving this problem.



Thanks in advance.