var timeout = 300;
var closetimer = 0;
var ddmenuitem = 0;

// open hidden layer
function mopen(id,parentid) {
	// cancel close timer
	mcancelclosetime();

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

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	
	// first position to under the main menu item if main menu item has absolute positioning...
	/*
	parentitem = ddmenuitem.parentNode;
	if (parentitem) {
		alert(parentitem.style.width);
		ddmenuitem.style.width = parentitem.style.width;
	}
	*/
	
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose() {
	if (ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime() {
	closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime() {
	if (closetimer) {
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}

// close layer when click-out
document.onclick = mclose