Cylcing movie clips

[dschiltz]

Hello, pretty quick & basic question here. I have three movie clips I want to use buttons to cycle through the clips and that have fades in between them. I think that I should be able to use an if else statement, but I think I'm goofin' it somewhere. I can't seem to get it to work so that all options are available no matter that clips the user is on. It will cycle through once and then I can't get it to remain active. The code I'm trying to work with is as follows:

prvBtn.onRelease = function() {
	if (sm03._alpha>=100) {
		sm03.onEnterFrame = function() {
			this._alpha -= speed;
			if (this._alpha<=0) {
				this._alpha = 0;
				delete this.onEnterFrame;
			} else {
				sm02.onEnterFrame = function() {
					this._alpha -= speed;
					if (this._alpha<=0) {
						this._alpha = 0;
						delete this.onEnterFrame;
					sm01.onEnterFrame = function() {
						this._alpha += speed;
						if (this._alpha>=100) {
							this._alpha = 100;
							delete this.onEnterFrame;
						}
					}
				}
			}
			}
		};
	}
};


nxtBtn.onRelease = function() {
	if (sm01._alpha>=100) {
		sm01.onEnterFrame = function() {
			this._alpha -= speed;
			if (this._alpha<=0) {
				this._alpha = 0;
				delete this.onEnterFrame;
			} else {
				sm03.onEnterFrame = function() {
					this._alpha -= speed;
					if (this._alpha<=0) {
						this._alpha = 0;
						delete this.onEnterFrame;
					sm02.onEnterFrame = function() {
						this._alpha += speed;
						if (this._alpha>=100) {
							this._alpha = 100;
							delete this.onEnterFrame;
						}
					}
				}
			}
			}
		};
	}
};

So any help would be appreciated.

THanks!