var mn_timeout	= 100;
var mn_closetimer	= 0;
var mn_ddmenuitem	= 0;
var TimeToFade = 500;
var TimeOutObj = 0;

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

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

	// get new layer and show it
	window.clearTimeout(TimeOutObj);
	mn_ddmenuitem = document.getElementById(id);
	mn_ddmenuitem.style.opacity = 1;
	mn_ddmenuitem.style.filter = 'alpha(opacity = 100)';	
	mn_ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(mn_ddmenuitem) mn_ddmenuitem.FadeState = 2;
	if(mn_ddmenuitem) fade(mn_ddmenuitem.id);
	//if(mn_ddmenuitem) mn_ddmenuitem.style.visibility = 'hidden';
}

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

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

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


function fade(eid)
{
  var element = document.getElementById(eid);
  if(element == null)
    return;
   
  if(element.FadeState == null)
  {
    if(element.style.opacity == null
        || element.style.opacity == ''
        || element.style.opacity == '1')
    {
      element.FadeState = 2;
    }
    else
    {
      element.FadeState = -2;
    }
  }
   
  if(element.FadeState == 1 || element.FadeState == -1)
  {
    element.FadeState = element.FadeState == 1 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
  }
  else
  {
    element.FadeState = element.FadeState == 2 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade;
    TimeOutObj = setTimeout("animateFade(" + new Date().getTime() + ",'" + eid + "')", 15);
  }  
  
}

function animateFade(lastTick, eid)
{  
  var curTick = new Date().getTime();
  var elapsedTicks = curTick - lastTick;
 
  var element = document.getElementById(eid);
 
  if(element.FadeTimeLeft <= elapsedTicks)
  {
    element.style.opacity = element.FadeState == 1 ? '1' : '0';
    element.style.filter = 'alpha(opacity = '
        + (element.FadeState == 1 ? '100' : '0') + ')';
    element.FadeState = element.FadeState == 1 ? 2 : -2;
    
		if (element.FadeState == -2)
		   element.style.visibility = 'hidden';
		else
  		element.style.visibility = 'visible';
  	    
    return;
  }
 
  element.FadeTimeLeft -= elapsedTicks;
  var newOpVal = element.FadeTimeLeft/TimeToFade;
  if(element.FadeState == 1)
    newOpVal = 1 - newOpVal;

  element.style.opacity = newOpVal;
  element.style.filter = 'alpha(opacity = ' + (newOpVal*100) + ')';
 
  TimeOutObj = setTimeout("animateFade(" + curTick + ",'" + eid + "')", 15);
}