// JavaScript Document
var timeout     = 500; 
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;