var oX = 0;
var oY = 0;
function posicion(o) {

oX = 0;
oY = 0;
    if (o.offsetParent) {
        while (1) {
            oX+=o.offsetLeft;
            oY+=o.offsetTop;
                if (!o.offsetParent) {
                    break;
                }
            o=o.offsetParent;
        }
    } else if (o.x) {
        oX+=o.x;
        oY+=o.y;
    }
}