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

	// close old layer
	if (ddmenuitem) {
		ddmenuitem.style.visibility = 'hidden';
		parent.style.background = 'none';
	}

	document.getElementById('submenu1').style.visibility = 'hidden';
	document.getElementById('submenu2').style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	parent = document.getElementById(id_parent);
	ddmenuitem.style.visibility = 'visible';
	parent.style.background = '#a6003f';
}

// close showed layer
function mclose()
{
	if (ddmenuitem) {
		ddmenuitem.style.visibility = 'hidden';
		parent.style.background = 'none';
	}
}

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

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