// Copyright 2006-2007 javascript-array.com
// http://javascript-array.com/scripts/simple_drop_down_menu/

var TimeOut         = 300;
var currentLayer    = null;
var currentMenu     = null;
var prevClassName = null;

var currentLayerNum = 0;
var closeTimer      = null;

// Open Hidden Layer
function mopen(n)
{
    var ly = document.getElementById("menu"+n);
    var mn = document.getElementById("mmenu"+n);

    mclose();

    if (ly) {
        mcancelclosetime();
        ly.style.visibility='visible';

        currentLayer = ly;
        currentLayerNum = n;            
    } 
    else if(currentLayer) {
        currentLayer.style.visibility='hidden';
        currentLayerNum = 0;
        currentLayer = null;
    }

    currentMenu = mn;
    prevClassName = currentMenu.className;
    currentMenu.className = "menu menu_glow";
}

// Turn On Close Timer
function mclosetime()
{
    closeTimer = window.setTimeout(mclose, TimeOut);
}

// Cancel Close Timer
function mcancelclosetime()
{
    if(closeTimer)
    {
        window.clearTimeout(closeTimer);
        closeTimer = null;
    }
}

// Close Showed Layer
function mclose()
{
    if (currentLayer) {
        currentLayer.style.visibility='hidden';
        currentLayerNum = 0;
    }

    if (currentMenu) {
        currentMenu.className = prevClassName;
    }

    currentLayer = null;
    currentMenu = null;
}

// Close Layer Then Click-out
document.onclick = mclose;