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

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

	// close old layer
	if(ddmenuitem) {
		ddmenuitem.style.visibility = 'hidden';
		tab.className = '';
	}

	// get new layer and show it
	ddmenuitem = document.getElementById('m' + id);
	ddmenuitem.style.visibility = 'visible';
	tab = document.getElementById('tab' + id);
	
	tab.className = 'current';
	
	

}

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

}

// 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;