var portfoliosubmenu;
var closetime = 0;

function menuopen(id)
{
	menustopclose();
	menuclose();
	if (portfoliosubmenu) portfoliosubmenu.style.visibility = 'hidden';
	portfoliosubmenu = document.getElementById(id);
	portfoliosubmenu.style.visibility = 'visible';
}

function menuclose()
{
	if (portfoliosubmenu) portfoliosubmenu.style.visibility = 'hidden';
}

function menucloseat()
{
	closetime = window.setTimeout(menuclose, 1000);
}

function menustopclose()
{
	if(closetime)
	{
		window.clearTimeout(closetime);
		closetime = 0;
	}

}