var timeout	= 400;
var closetimer	= 0;
var ddmenuitem	= 0;

function mopen(id){	
	mcancelclosetime();
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';
	}
function mclose() {
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
	}
function mclosetime() {
	closetimer = window.setTimeout(mclose, timeout);
	}
function mcancelclosetime() {
	if(closetimer){
		window.clearTimeout(closetimer);
		closetimer = null;
		}
	}
document.onclick = mclose();