Scroller problem

im working on a slider that i want to position to the stage according to the _ymouse. Here’s the problem. I’m using some code that i really like because of the ease on it. But i’m having problems getting it to position where i want it and control it so that the top and bottom of the clip refers to the stage…if that makes any sense. I did not write the code, but i’ve changed it so that its vertical as you’ll see. Everything “works” except aligning it to the stage according to _ymouse

Kind of like the portfolio page here. but i want the ease action that i have in the code. Any thoughts

Heres my code

menuActive = 1;
bounce("_alpha",100,scroller,5,0);
startPosition = -60;
scrollArea = 908;
this.onMouseMove = function() {
	if ((this._ymouse>startPosition) && (this._ymouse<(startPosition+scrollArea)) && (this._xmouse>scroller._x) && (this._xmouse<(scroller._x+425)) && (menuActive == 1)) {
		if (scroller._height>scrollArea) {
			positionScroller();
		}
	}
};
getScrollerWidth = function () {
	scrollerWidth = scroller._height;
};
getScrollerWidth();
positionScroller = function () {