function showMenu(elemId, parentId) {
    elem = document.getElementById(elemId);
    elem2 = document.getElementById(parentId);
    elem.style.left = elem2.offsetLeft+'px';
    elem.style.top = elem2.offsetTop+22+'px';
    elem.style.visibility='visible';
}

function hideMenu(elemId) {
    elem = document.getElementById(elemId);
    
    elem.style.visibility = 'hidden';
}