var timeout = 200;
var closetimer = 0;
var ddmenuanchor = 0;
var ddmenuitem = 0;

// show hidden layer
function mopen(aid, divid) {
    // cancel close timer
    mcancelclosetime();
    
    // close old layer
    if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
    
    // get anchor and highlight it
    ddmenuanchor = document.getElementById(aid);
    ddmenuanchor.style.backgroundColor = '#ceceec';
    ddmenuanchor.style.color = '#00009c';
    
    // get layer and show it
    ddmenuitem = document.getElementById(divid);
    ddmenuitem.style.visibility = 'visible';
}

// close shown layer
function mclose() {
    // get anchor and unhighlight it
    if(ddmenuanchor) {
        ddmenuanchor.style.backgroundColor = '#00009c';
        ddmenuanchor.style.color = '#ffffff';
    }
    
    // get layer and hide it
    if(ddmenuitem) {
        ddmenuitem.style.visibility = 'hidden';
    }
}

// start 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;