var timeout	= 1000;
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;
	}
}