function pageX(elem){
    return elem.offsetParent ? elem.offsetLeft + pageX(elem.offsetParent) : elem.offsetLeft;
}

function pageY(elem){
    return elem.offsetParent ? elem.offsetTop + pageY(elem.offsetParent) : elem.offsetTop;
}

function parentX(elem){
    return elem.offsetParent == elem.parentNode ? elem.offsetLeft : pageX(elem) - pageX(elem.parentNode);
}

function parentY(elem){
    return elem.offsetParent == elem.parentNode ? elem.offsetTop : pageY(elem) - pageY(elem.parentNode);
}


onload = function(){
    alert(pageX(document.getElementById('div2')));
}