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

//alert('in');

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

    // close old layer
    if (ddmenuitem) ddmenuitem.style.visibility = 'hidden';
    if (ddmenuitem) ddmenuitem.style.display = 'none';

    // get new layer and show it
    ddmenuitem = document.getElementById(id);
    ddmenuitem.style.visibility = 'visible';
    ddmenuitem.style.display = '';
    ddmenuitem.style.zIndex = '100';
    //ddmenuitem.style.width = '170px';
}
// close showed layer
function mclose() {
    if (ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// 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;