No rewind when the UP button is pressed

programming flash
1

Hi!
I don’t know how to change this code so that the movieclip doesn’t scroll upwards in rewind style when the Up button is pressed. I’d like that the Up button acts like the **Down **button, so that when it is pressed it scrolls bit for bit and doesn’t rewind the whole movieclip. Anyone that can help me out on this one?

scrolling = function () {
	var scrollHeight:Number = scrollbg._height;
	var contentHeight:Number = contentMain._height;
	var draggerHeight:Number = dragger._height;
	var maskHeight:Number = maskedView._height;
	//
	var initPosition:Number = dragger._y=scrollbg._y;	var initContentPos:Number = contentMain._y;
	var finalContentPos:Number = maskHeight-contentHeight+initContentPos;
	//
	var left:Number = scrollbg._x;
	var top:Number = scrollbg._y;
	var right:Number = scrollbg._x;
	var bottom:Number = scrollbg._height-draggerHeight+scrollbg._y;
	//
	var dy:Number = 0;
	var speed:Number = 10;
	var moveVal:Number = (contentHeight-maskHeight)/(scrollHeight-draggerHeight);
	//
	dragger.onPress = function() {
		var currPos:Number = this._y;
		startDrag(this, false, left, top, right, bottom);
		this.onMouseMove = function() {
			dy = Math.abs(initPosition-this._y);
			contentMain._y = Math.round(dy*-1*moveVal+initContentPos);
		};
	};
	dragger.onMouseUp = function() {
		stopDrag();
		delete this.onMouseMove;
	};
	btnUp.onPress = function() {
		this.onEnterFrame = function() {
			if (contentMain._y + speed < maskedView._y) {
				trace(dragger._y + " " + top);
				if (dragger._y <= top) {
					dragger._y = top;
					contentMain._y += speed;
				} else {
					contentMain._y += speed;
					dragger._y -= speed / moveVal;
				}
			} else {
				dragger._y = top;
				contentMain._y = maskedView._y;
				delete this.onEnterFrame;
			}
		};
	};
	btnUp.onDragOut = function() {
		delete this.onEnterFrame;
	};
	btnUp.onMouseOut = function() {
		delete this.onEnterFrame;
	};
	btnDown.onPress = function() {
		this.onEnterFrame = function() {
			if (contentMain._y - speed >finalContentPos) {
				if (dragger._y>=bottom) {
					contentMain._y -= speed;
					dragger._y = bottom;
				} else {
					contentMain._y -= speed;
					dragger._y += speed/moveVal;
				}
			} else {
				dragger._y = bottom;
				contentMain._y = finalContentPos;
				delete this.onEnterFrame;
			}
		};
	};
	btnDown.onRelease = function() {
		delete this.onEnterFrame;
	};
	btnDown.onDragOut = function() {
		delete this.onEnterFrame;
	};
};
scrolling();

Best regards
JoakimN