var displaymenu = false;

function showMenu(obj) {    
    var submenu = document.getElementById(obj);
    submenu.style.display = 'block';
    displaymenu = true;
    }
    
function hideMenu(obj) {
    var submenu = document.getElementById(obj);
    if (displaymenu) {
        submenu.style.display = 'block';
    } else {
        submenu.style.display = 'none';
        }
    }
    
function checkMenu(obj) {
    setTimeout("hideMenu('submenu1')",300) ;
    displaymenu = false ;
    }