Landing in a certain place

hi -
im sure this is in the forum but i dont know quite how to search for it.

im looking for action script that controls if MovieClip A lands at x coordinate and y cooridnate, then make MovieClip A1 happen.

does this actionscript go on the movie clip, a button or the frame?

what is the script?

oh yeah - its AS2
thanks
ellare:hat: