var timeout	= 2000;
var closetimer	= 0;
var ddmenuitem	= 0;

// open hidden layer
function eglopen(id)
{	
	// cancel close timer
	eglcancelclosetime();

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

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

}

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

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

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

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