function getElementAbsolutePosition(elemID) {
    var offsetTrail = document.getElementById(elemID);
    var offsetLeft = 0;
    var offsetTop = 0;
    while (offsetTrail) {
        offsetLeft += offsetTrail.offsetLeft;
        offsetTop += offsetTrail.offsetTop;
        offsetTrail = offsetTrail.offsetParent;
    }
    if (navigator.userAgent.indexOf('Mac') != -1 && typeof document.body.leftMargin != 'undefined') {
        offsetLeft += document.body.leftMargin;
        offsetTop += document.body.topMargin;
    }
    return { left: offsetLeft, top: offsetTop };
}