Page validation problem

[Afrow UK]

If the user enters a directory with 'quake2' in it, and has the 'Use Quake2 directory rename function' CheckBox selected, then it comes up with an error message telling the user that you cnnot have both.
I need it to go back to the custom page after clicking OK.
If I call the custom page function, it instead jumps a page ahead instead of going back to the custom page.

How can I get it to go back a page?


-Stuart