var mPosX = 0;
var mPosY = 0;

function GetMousePosition (e) {
	
	if (!e) var e = window.event;

	if (e.pageX || e.pageY) {
		
		mPosX = e.pageX;
		mPosY = e.pageY;
		
	} else if (e.clientX || e.clientY) 	{
	
		mPosX = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
		mPosY = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
	}
}

document.onmousemove = GetMousePosition;