var timeout = 200;
var closetimer = 0;
var ddmenuitem = 0;

// 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 != null){
    		ddmenuitem.style.visibility = 'visible';
	}
    
 }

 // close showed layer
 function mclose()
 {
    	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
 }
    
 // go close timer
 function mclosetime()
 {
    	closetimer = window.setTimeout(mclose, timeout);
 }
    
 // cancel close timer
  function mcancelclosetime()
  {
    	if(closetimer)
    	{
    		window.clearTimeout(closetimer);
    		closetimer = null;
    	}
  }
    
// close layer when click-out
document.onclick = mclose;