Swapping visiblity

1 

var depth = 0;
holder_mc = _root.createEmptyMovieClip("holder_mc", depth++);
mc_1 = holder_mc.createEmptyMovieClip("mc_1", depth++);
mc_2 = holder_mc.createEmptyMovieClip("mc_2", depth++);
holder_mc._x = 10;
holder_mc._y = 10;
var loadCount = 1;
swapNumber = function(){
	switch (loadCount) {
	  case 1:
		loadCount++;
		return loadCount;
		break;
	  case 2:
		loadCount--;
		return loadCount;
		break;
	  default:
		return loadCount;
	}
};
swapClips = function(){
	var show_num = "mc_"+swapNumber();
	var hide_num = "mc_"+swapNumber();
	show_num._visible = true;
	hide_num._visible = false;
};
loadFile = function(filename){
	swapClips();
	//load file into shown clip
	//preload next file into hidden clip
};
loadFile("file.swf");

Yeah, I can’t workout how to make them swapVis basically. Any more efficient means/methods would be welcomed.
I feel like my code is getting too straight up and down and not looking out to make it shorter etc.