ActionScript 2.0 :: Loading External SWF Files With Button Click

First of all, right now I have 2 buttons, which are defined as buttons. Clicking on button1 loads swf1, clicking button2 unloads swf1 and loads swf2. Heres the basic code for that transition which is pasted ON the button...

on (release) {
if (_root.currMovie == undefined) {
_root.currMovie = "F2";
container.loadMovie("F2.swf");
} else if (_root.currMovie != "F2") {
if (container._currentframe >= container.midframe) {
_root.currMovie = "F2";
container.play();
}}}

This works like a charm, no problems. The problem I am having is that I need the button (which will eventually be a part of an animated drop down menu) to have more functionality. When I try to make a movieclip button, no variation of this code above will work to load the swf. I am totally lost. Here is the latest incarnation of the movie clip button code. This version is in the timeline, but I've tried variations directly on the movie clip as well

mc_HeightTest.onPress = HeightMovie
function HeightMovie(){
if (_root.currMovie == undefined) {
_root.currMovie = "F2";
container.loadMovie("F2.swf");
} else if (_root.currMovie != "F2") {
if (container._currentframe >= container.midframe) {
_root.currMovie = "F2";
container.play();
}}}

Why the code pasted on the button will not work when its used in conjunction with a movie clip button?