var timeout	= 500;
var closetimer	= 0;
var ddmenuitem	= 0;
var opentimer = 0;

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

	// close old layer
	if (ddmenuitem && ddmenuitem != document.getElementById(id)) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
  opentimer = window.setTimeout("ddmenuitem.style.visibility = 'visible'",500);
}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

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

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

function clickin(id) {
  if (opentimer) {
    window.clearTimeout(opentimer);
    opentimer = null;
  }
  ddmenuitem = document.getElementById(id);
  ddmenuitem.style.visibility = 'visible';
}