Javascripts : get mouse position

function posicion_mouse(e) {
var posx = 0;
var posy = 0;
if(!e){ var e = window.event }

posx = (e.pageX) ? e.pageX : window.event.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
posy = (e.pageY) ? e.pageY : window.event.clientY + document.body.scrollTop + document.documentElement.scrollTop;

return {y: posy, x:posx}
}

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