Zoom to Mouse X & Y


Got a question regarding a zoomable map I’m building. I’ve got the zoom function sorted, but I’d like to build something that zooms in on the current mouse position, rather than setting the map’s x & y to that of the mouse, that’s not quite right, attached is the code I’m using, anyone any ideas how I acheive this?

onMouseDown = function() {
	curMouseX = _root._xmouse;
	curMouseY = _root._ymouse;
	map._xscale += 10;
	map._yscale += 10;
	map._x = curMouseX;
	map._y = curMouseY;