var upMainMenuID="";
  var menuTime;
  function change(mid,clear)
  {
	  var tmpMenu = document.getElementById(upMainMenuID);	  				
	  tmpMenu.style.backgroundImage='url(../images/menu_bg01.gif)';
	  tmpMenu = document.getElementById(upMainMenuID + "sub");
	  tmpMenu.style.display = "none";
	  tmpMenu = document.getElementById(mid);
	  tmpMenu.style.backgroundImage='url(../images/menu_bg02.gif)';
	  tmpMenu = document.getElementById(mid + "sub");
	  tmpMenu.style.display = "";
	  upMainMenuID = mid;
	  
	  if (clear){
		  if (menuTime) {window.clearTimeout(menuTime);}
		  menuTime = window.setTimeout("restoreMenu();",3000);		 
	  }	
	    
  }
  function restoreMenu()
  {
	  var tmpMenu;
	  if (upMainMenuID != "")
	  {
		  tmpMenu = document.getElementById(upMainMenuID);
		  tmpMenu.style.backgroundImage='url(../images/menu_bg01.gif)';
		  tmpMenu = document.getElementById(upMainMenuID + "sub");
		  tmpMenu.style.display = "none";
	  }
	  tmpMenu = document.getElementById("mmfirst");
	  tmpMenu.style.backgroundImage='url(../images/menu_bg01.gif)';
	  tmpMenu = document.getElementById("mmfirstsub");
	  tmpMenu.style.display = "";
	  upMainMenuID = "mmfirst";
  }
  restoreMenu();