hello, i have a problem which i won't babble about - the basic point is that i
need to make a piece of action script show in a button only on a certain frame.
i don't know how to do this - could anyone please help? thanks in advance for
your time, mdk. :)

Why would you need to make Actionscript show in a button - or anywhere for that
matter.

If you mean you need ActionScript that makes a button show in a certain frame:

Make sure the frame is a keyframe:

myButton._visible = true;