var mousePos = {x:0,y:0};

function getMouseXY(e) {
	if(document.all){ // grab the x-y pos.s if browser is IE
		mousePos.x = event.clientX + document.body.scrollLeft;
		mousePos.y = event.clientY + document.body.scrollTop;
	}else{  // grab the x-y pos.s if browser is NS
		mousePos.x = e.pageX;
		mousePos.y = e.pageY;
	}  
	// catch possible negative values in NS4
	if(mousePos.x < 0) mousePos.x = 0;
	if(mousePos.y < 0) mousePos.y = 0; 
}