Javascript to find X ,Y position of cursor

window.onload = init;
function init() {
if (window.Event) {
document.captureEvents(Event.MOUSEMOVE);
}
document.onmousemove = getCursorXY;
}

function getCursorXY(e) {
document.getElementById(‘cursorX’).value = (window.Event) ? e.pageX : event.clientX + (document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft);
document.getElementById(‘cursorY’).value = (window.Event) ? e.pageY : event.clientY + (document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop);
}