var timeout         = 1200;
var closetimer		= 1200;
var ddmenuitem      = 0;
var activeMenu = "";

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

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

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

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

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

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