Controlling an button's alpha with if/else

[ammdaddy]

I have an emptyMovieClip and a button on my stage. I'd like to control the alpha of the button depending on whether a movieclip is loaded into the emptyMovieClip or not. I'm just a beginner at Flash and have little programming experience.

if a movie is loaded in the emptyMovieClip, button alpha = 100%

else button alpha = 0%

I know. It's a sorry attempt . . . :(

Can someone help?

[tofuisonmyside]

for example,

emptyMovieClip.loadMovie("movie.swf")
emptyMovieClip.onEnterFrame = function(){
var kbLoaded = Math.floor(this.getBytesLoaded()/1024);
var kbTotal = Math.floor(this.getBytesTotal()/1024);
var k = int(100*kbLoaded/kbTotal);
if ((kbLoaded>=kbTotal) && kbTotal>1) {
this._parent.myButton._alpha = 100;
}
}

[ammdaddy]

for example,

emptyMovieClip.loadMovie("movie.swf")
emptyMovieClip.onEnterFrame = function(){
var kbLoaded = Math.floor(this.getBytesLoaded()/1024);
var kbTotal = Math.floor(this.getBytesTotal()/1024);
var k = int(100*kbLoaded/kbTotal);
if ((kbLoaded>=kbTotal) && kbTotal>1) {
this._parent.myButton._alpha = 100;
}
}

Many thanks tofu.