var timeout	= 500;
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;