console menu/gui

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Sph!nx

I really need some help with this. I must have overlooked some stuff in the manual or forum...

Here's the thing:

I have a program that has a the 'setbuffer backbuffer' code. It has a mainloop and renders an image. (with the correct setup of 'updateworld', 'renderworld' and 'flip')

Now I want to call up another function with the press of a button that renders something else, like a picture and later other stuff.

How do I bring one function to the background and another to the foreground?

I really need to know this ...
thanks in advanced!