var timeout	= 500;
var closetimer	= 0;
var menuitem	= 0;

function mopen(id)
{	
	mclosecancel();

	if(menuitem) menuitem.style.visibility = 'hidden';

	menuitem = document.getElementById(id);
	menuitem.style.visibility = 'visible';

}

function mclose()
{
	if(menuitem) menuitem.style.visibility = 'hidden';
}

function mcloseset()
{
	closetimer = window.setTimeout(mclose, timeout);
}

function mclosecancel()
{
	if(closetimer)
	{
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

document.onclick = mclose;