var timeout_v	= 500;
var closetimer_v	= 0;
var ddmenuitem_v	= 0;

// open hidden layer
function mopen_v(id){	
	// cancel close timer
	mcancelclosetime_v();

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

	// get new layer and show it
	ddmenuitem_v = document.getElementById(id);
	ddmenuitem_v.style.visibility = 'visible';

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

// go close timer
function mclosetime_v(){
	closetimer_v = window.setTimeout(mclose_v, timeout_v);
}

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

// close layer when click-out
document.onclick = mclose_v;