/* http://www.w3schools.com/dhtml/tryit.asp?filename=trydhtml_mouse_cursorimage */

function cursor(event)
{
document.getElementById('trail').style.visibility="visible";
document.getElementById('trail').style.position="absolute";
document.getElementById('trail').style.left=event.clientX+10;
document.getElementById('trail').style.top=event.clientY+10;
}