function move_the_mouse(e)
{
	var x, y, div = document.getElementById("my_div");
	
	if (!e)
	{
		x = event.x;
		y = event.y;
	} else {
		x = e.mouseX;
		y = e.mouseY;
	}
	
	div.style.left = x + window.scrollLeft + 5 +"px";
	div.style.top = y + window.scrollTop + 5 +"px";
}

window.onmousemove = move_the_mouse;