Multiple buttons +multiple (but same...)functions

I have 48 buttons, they have instansname btn1, btn2, btn3 etc…
than I have 48 movieclip that are named mc1, mc2, mc3 etc…

if you click on “btn1” I want “mc1” to be visible
if you click on “btn2” I want “mc2” to be visible etc…

what is the best way to do that in ActionScript 3.0??

Thanks…