Mouse Wheel для приближения карты

[ilikali]

Есть карта.Все работает прекрасно вот только заказчик попросил чтоб ползунок приближения работал с помощью ползунка мыши. вот код самой работы

stageW = 982;
stageH = 566;
minimapWidth = 100;
zoomFactor = 20;
tweenSpeed = 3;
alphaSpeed = 5;
moveAmount = 20;
zoomAmount = 3;
cropWidth = stageW;
cropHeight = stageH;
destAlpha = 0;
ID = 0;
 
 
// Set the mousewheel scroll speed here
scrollSpeed = 10
 
var mouseListener:Object = new Object(this);
mouseListener.onMouseWheel = function(wheelNum:Number) {
	if (scroll_mc.scrollBttn._y>=scroll_mc.scrollBttn.originY) 
	{
		scroll_mc.scrollBttn._y -= (wheelNum/scrollRatio)*scrollSpeed;
		if (scroll_mc.scrollBttn._y<scroll_mc.scrollBttn.originY) {
			scroll_mc.scrollBttn._y = scroll_mc.scrollBttn.originY;
		} else if (scroll_mc.scrollBttn._y>scroll_mc.scrollBttn.originY+scroll_mc.scrollBar._height-scroll_mc.scrollBttn._height) {
			scroll_mc.scrollBttn._y = scroll_mc.scrollBttn.originY+scroll_mc.scrollBar._height-scroll_mc.scrollBttn._height;
		}
	}
	if (scroll_mc.scrollBttn._y>scroll_mc.scrollBttn.maxY) {
		scroll_mc.scrollBttn._y = scroll_mc.scrollBttn.maxY;
	}
};
Mouse.addListener(mouseListener);
//
// SCROLL BAR PRESS
//
 
 
 
 
 
 
cursor_mc._visible = false;
holder_mc._alpha = 0;
minimap_mc._alpha = 0;
bttn.enabled = false;
tweenImage = function () {
	holder_mc._alpha = holder_mc._alpha+((destAlpha-holder_mc._alpha)/alphaSpeed);
	minimap_mc._alpha = holder_mc._alpha;
	holder_mc.holder._x = holder_mc.holder._x+((holder_mc.marker._x-holder_mc.holder._x)/tweenSpeed);
	holder_mc.holder._y = holder_mc.holder._y+((holder_mc.marker._y-holder_mc.holder._y)/tweenSpeed);
	holder_mc._xscale = holder_mc._xscale+((destScale-holder_mc._xscale)/tweenSpeed);
	holder_mc._yscale = holder_mc._xscale;
};
duplicateImage = function (_arg2, _arg3) {
	var _local1 = new flash.display.BitmapData(_arg2._width, _arg2._height);
	_local1.draw(_arg2);
	_arg3.attachBitmap(_local1, 1, true, true);
};
loadImage = function () {
	bttn.enabled = false;
	var _local1 = new Color(bg_mc);
	setColour = "0x"+Colour[ID];
	_local1.setRGB(setColour);
	holder_mc._alpha = 0;
	destAlpha = 0;
	scroll_mc.scrollBttn._x = 0;
	holder_mc.holder.loadMovie(Image[ID]);
};
imageLoaded = function () {
	duplicateImage(holder_mc.holder, holder_mc.holder);
	duplicateImage(holder_mc.holder, minimap_mc.holder);
	minimap_mc.holder._width = minimapWidth;
	minimap_mc.holder._yscale = minimap_mc.holder._xscale;
	minimap_mc.frame_mc._width = (minimap_mc.mask_mc._width=minimap_mc.holder._width);
	minimap_mc.frame_mc._height = (minimap_mc.mask_mc._height=minimap_mc.holder._height);
	ratioWidth = holder_mc.holder._width/minimap_mc._width;
	ratioHeight = holder_mc.holder._height/minimap_mc._height;
	minimap_mc.win_mc.win._width = cropWidth/ratioWidth;
	minimap_mc.win_mc.win._height = cropHeight/ratioHeight;
	imageWidth = holder_mc.holder._width;
	imageHeight = holder_mc.holder._height;
	holder_mc.holder._x = (-imageWidth)/2;
	holder_mc.holder._y = (-imageHeight)/2;
	holder_mc.marker._x = holder_mc.holder._x;
	holder_mc.marker._y = holder_mc.holder._y;
	holder_mc._x = cropWidth/2;
	holder_mc._y = cropHeight/2;
	scroll_mc.scrollBttn._x = 0;
	holder_mc._height = cropHeight/zoomFactor;
	holder_mc._xscale = holder_mc._yscale;
	minScale = holder_mc._xscale;
	destAlpha = 100;
	bttn.enabled = true;
};
minimap_mc.onPress = function() {
	holder_mc.marker._x = -minimap_mc.holder._xmouse;
	holder_mc.marker._y = -minimap_mc.holder._ymouse;
};
bttnLeft.arrow_mc.arrow._rotation = -90;
bttnBttm.arrow_mc.arrow._rotation = -180;
bttnRight.arrow_mc.arrow._rotation = 90;
bttnLeft.bttn.onPress = function() {
	bttnLeft.onEnterFrame = function() {
		if (holder_mc.marker._x<0) {
			holder_mc.marker._x = holder_mc.marker._x+moveAmount;
		}
	};
};
 
 
 
 
 
 
 
 
 
bttnLeft.bttn.onRelease = (bttnLeft.bttn.onReleaseOutside=function () {
	delete bttnLeft.onEnterFrame;
});
bttnTop.bttn.onPress = function() {
	bttnTop.onEnterFrame = function() {
		if (holder_mc.marker._y<0) {
			holder_mc.marker._y = holder_mc.marker._y+moveAmount;
		}
	};
};
bttnTop.bttn.onRelease = (bttnTop.bttn.onReleaseOutside=function () {
	delete bttnTop.onEnterFrame;
});
bttnBttm.bttn.onPress = function() {
	bttnBttm.onEnterFrame = function() {
		if (holder_mc.marker._y>(-imageHeight)) {
			holder_mc.marker._y = holder_mc.marker._y-moveAmount;
		}
	};
};
bttnBttm.bttn.onRelease = (bttnBttm.bttn.onReleaseOutside=function () {
	delete bttnBttm.onEnterFrame;
});
bttnRight.bttn.onPress = function() {
	bttnRight.onEnterFrame = function() {
		if (holder_mc.marker._x>(-imageWidth)) {
			holder_mc.marker._x = holder_mc.marker._x-moveAmount;
		}
	};
};
bttnRight.bttn.onRelease = (bttnRight.bttn.onReleaseOutside=function () {
	delete bttnRight.onEnterFrame;
});
bttnReset.bttn.onPress = function() {
	holder_mc.marker._x = holder_mc.holder._x;
	holder_mc.marker._y = holder_mc.holder._y;
	scroll_mc.scrollBttn._x = 0;
};
bttnMinus.bttn.onPress = function() {
	bttnMinus.onEnterFrame = function() {
		if (scroll_mc.scrollBttn._x>zoomAmount) {
			scroll_mc.scrollBttn._x = scroll_mc.scrollBttn._x-zoomAmount;
		} else {
			scroll_mc.scrollBttn._x = 0;
		}
	};
};
bttnMinus.bttn.onRelease = (bttnMinus.bttn.onReleaseOutside=function () {
	delete bttnMinus.onEnterFrame;
});
bttnPlus.bttn.onPress = function() {
	bttnPlus.onEnterFrame = function() {
		if (scroll_mc.scrollBttn._x<(100-zoomAmount)) {
			scroll_mc.scrollBttn._x = scroll_mc.scrollBttn._x+zoomAmount;
		} else {
			scroll_mc.scrollBttn._x = 163;
		}
	};
};
bttnPlus.bttn.onRelease = (bttnPlus.bttn.onReleaseOutside=function () {
	delete bttnPlus.onEnterFrame;
});
bttn.onPress = function() {
	cursor_mc.gotoAndStop(2);
	holder_mc.marker.startDrag(false, -imageWidth, -imageHeight, 0, 0);
};
bttn.onRelease = (bttn.onReleaseOutside=function () {
	cursor_mc.gotoAndStop(1);
	stopDrag();
});
bttn.onRollOver = function() {
	cursor_mc._visible = true;
	Mouse.hide();
};
bttn.onRollOut = (bttn.onDragOut=function () {
	cursor_mc._visible = false;
	Mouse.show();
});
scroll_mc.scrollBttn.onPress = function() {
	this.startDrag(0, 0, 0, 163, 0);
};
scroll_mc.scrollBttn.onRelease = (scroll_mc.scrollBttn.onReleaseOutside=function () {
	this.stopDrag();
});
scroll_mc.gridBttn.onPress = function() {
	scroll_mc.scrollBttn._x = scroll_mc._xmouse-(scroll_mc.scrollBttn._width/2);
	if (scroll_mc.scrollBttn._x>100) {
		scroll_mc.scrollBttn._x = 100;
	} else if (scroll_mc.scrollBttn._x<(scroll_mc.scrollBttn._width/2)) {
		scroll_mc.scrollBttn._x = 0;
	}
};
onEnterFrame = function () {
	destScale = (scroll_mc.scrollBttn._x+minScale)*zoomFactor;
	if (destScale == (minScale*zoomFactor)) {
		holder_mc.marker._x = (-imageWidth)/2;
		holder_mc.marker._y = (-imageHeight)/2;
	}
	ratioScale = holder_mc._xscale/minimap_mc._xscale;
	minimap_mc.win_mc._width = minimapWidth/(holder_mc._width/cropWidth);
	minimap_mc.win_mc._height = minimap_mc.holder._height/(holder_mc._height/cropHeight);
	minimap_mc.win_mc.win._x = (-(holder_mc.holder._x/ratioWidth))*ratioScale;
	minimap_mc.win_mc.win._y = (-(holder_mc.holder._y/ratioHeight))*ratioScale;
	loading = holder_mc.holder.getBytesLoaded();
	filesize = holder_mc.holder.getBytesTotal();
	percentage = Math.round((loading/filesize)*100);
	if (isNaN(percentage)) {
		percentage = 0;
	}
	preloader_mc.txt.text = ("LOADING "+percentage)+"%";
	preloader_mc._alpha = 100-holder_mc._alpha;
	cursor_mc._x = _root._xmouse;
	cursor_mc._y = _root._ymouse;
	tweenImage();
};
construct = function () {
	i = 0;
	while (i<total) {
		Image[i] = xmlNode.childNodes[i].attributes.Image;
		Name[i] = xmlNode.childNodes[i].attributes.Name;
		Colour[i] = xmlNode.childNodes[i].attributes.Colour;
		select_mc.selectBttn_mc.selectBttn.duplicateMovieClip("selectBttn"+i, i);
		select_mc.selectBttn_mc["selectBttn"+i]._y = ((-select_mc.selectBttn_mc.selectBttn._height)-1)-(select_mc.selectBttn_mc.selectBttn._height*i);
		select_mc.selectBttn_mc["selectBttn"+i].txt_mc.txt.text = Name[i];
		select_mc.selectBttn_mc["selectBttn"+i].ID = i;
		i++;
	}
	select_mc.selectShow.txt_mc.txt.text = Name[ID];
	loadImage();
};
loadXML = function (_arg2) {
	if (_arg2) {
		xmlNode = this.firstChild;
		Image = [];
		Name = [];
		Colour = [];
		total = xmlNode.childNodes.length;
		construct();
	} else {
		trace("Error loading XML");
	}
};
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("content.xml");
stop();

на сколько видно из кода есть мувик с именем scroll_mc в нем находятся scrollBttn и gridBttn.нужно сделать так чтоб когда пользователь крутил скрол на мыше карта приближалась.Помогите пожалуйста.