Redirect to different urls after submission of web form

Redirect to different urls after submission of web form

Hi there - we have an embedded form that has a radio option of 3 choices:

-pay online after submission 
-payment already on file
-mail payment

I can setup the single URL redirect of a successful submission easy enough for all, but I would like to know if someone can show me a way to script that so each of those 3 choices opens a different page, so 'pay online after submission' when selected and submitted will open the payment gateway url, and the other 2 options will redirect to a static html page on what to do next. 

Any pointers here?

thanks!