// Copyright 2006-2007 javascript-array.com
    var timeout	= 100;
    var closetimer	= 0;
    var ddmenuitem	= 0;

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

        // close old layer
        if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

        // get new layer and show it
        ddmenuitem = document.getElementById(id);
        ddmenuitem.style.visibility = 'visible';
   }
    // 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;