var currentId = "";
function showMenu (e, id) {
    if(!document.getElementById) return;
    if(currentId == id) return;
    closeMenu();
    var obj = document.getElementById(id);
    var x = e.clientX + scrollLeft();
    var y = e.clientY + scrollTop();
    obj.style.visibility = "visible";
    currentId = id;
}
function closeMenu () {
    if(!document.getElementById) return;
    if(!currentId) return;
    var obj = document.getElementById(currentId);
    obj.style.visibility = "hidden";
    currentId = "";
}
function bodyClick (e) {
    closeMenu();
}
if(document.getElementById)
    document.onclick = bodyClick;

function scrollLeft () {
    if(window.pageXOffset)
        return window.pageXOffset;
    if(document.compatMode == "CSS1Compat")
        return document.body.parentNode.scrollLeft;
    if(document.body.scrollLeft)
        return document.body.scrollLeft;
    return 0;
}
function scrollTop () {
    if(window.pageYOffset)
        return window.pageYOffset;
    if(document.compatMode == "CSS1Compat")
        return document.body.parentNode.scrollTop;
    if(document.body.scrollTop)
        return document.body.scrollTop;
    return 0;
}