// JavaScript Document
// For Navigation Bar
// 
var timeout=500;
var closetimer=0;
var ddmenuitem=0;

function mopen(id){
	//cancel closetimer
	mcancelclosetime();
	
	//close the old layer
	if (ddmenuitem) 
	ddmenuitem.style.visibility="hidden";
	
	//get a new layer and display it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility="visible";
}

//close the displayed menu
function mclose(){
	if (ddmenuitem)
	ddmenuitem.style.visibility="hidden";
}
	
//go and close it all
function mclosetime(){
	closetimer = window.setTimeout(mclose, timeout);
}

//cancel closetimer 
function mcancelclosetime(){
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

document.onclick = mclose;