var timeout = 500;
var closetimer = 0;
var ddmenuitem = 0;

// open hidden layer
function mopen(id) {
    // cancel close timer
    mcancelclosetime();

    // close old layer
    if (ddmenuitem) {
        mclose();        
    }

    // get new layer and show it
    ddmenuitem = document.getElementById(id);
    ddmenuitem.style.display = 'block';

    document.getElementById(id + "m").className += " newtopmenumo";  
}
// close showed layer
function mclose() {
    if (ddmenuitem) {
        ddmenuitem.style.display = 'none';
        document.getElementById(ddmenuitem.id + "m").className = document.getElementById(ddmenuitem.id + "m").className.replace(" newtopmenumo", "");
         
    }
}

// go close timer
function mclosetime() {
    closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime() {
    if (closetimer) {
        window.clearTimeout(closetimer);
        closetimer = null;
    }
}

// close layer when click-out
document.onclick = mclose;