var timeout	= 100;
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;