Action script question Prototype and movieLoader

[blanius]

Ok this is what I've got now but it doesn't work I imagine I'm thinking it out wrong.

MovieClip.prototype.fadeUp=function(){

	this.doFade=function(){

		if (this._alpha<100){

				this._alpha+=10;

				}
		if (this._alpha>=100){
			 clearInterval(this.intervalID);
			 }

		}//end do fade function
		this.intervalID=setInterval(doFade,50);
	}//end