Very basic question - 2 buttons 2 movieclips

Hello,

I have 2 buttons which initiate 2 movie clips.

I have put the first button in frame 1 with a stop command and the corresponding movie clip in frame 2 (both on the same timeline). I have attached the following script to the button:

on (release) {
_root.dropMenu.play();

}

where dropMenu is the instance name of the movie clip that I want the button to initiate.

Problem is that is doesn’t work! Is this the correct thing to do? On my second button I attach a script which tells it to goto and play a specific frame which contains the corresponding movie clip. This seems to work but it initiates both the movie clips - not just the one I want it to!

Any help most appreciated.
Thanks