var timeout = 20;
var closetimer = 0;
var ddmenuitem = 0;

function mopen(id) {	
	mcancelclosetime();
	if(ddmenuitem) {
		ddmenuitem.style.visibility = "hidden";
	}
	ddmenuitem = document.getElementById(id);
	
	if(ddmenuitem == undefined || !ddmenuitem) {
		return;
	}
	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;
	}
}