Reverse frames

hi there,and thanks for the tips that you’re giving us flash ‘gurus’…
well i have 3 movieclips (my_btn,my2_btn,my3_btn)which are thread like buttons with labels…up to here i don’t have any broblems…
when the first button is pressed i have a text with a mask effect…so when i press the second button i want to play in reverse the text with the mask and go to the second movie which is another text with another effect and so on…!!
what should i do?
please give me an answer?
thanx