var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;

// åben hidden layer
function mopen(id) {
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// ny layer og vis
	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;
	}
}

// luk layer 
document.onclick = mclose;