if (document.images) {
		var logoOFF = new Image();
		logoOFF.src = "/img/go_off.gif";
		var logoON = new Image();
		logoON.src = "/img/go_on.gif";
	}
	
	var isMenuAct = false; // the menu is not active yet
	
	function actMenuItem(imgName) {
	  isMenuAct = true; // the menu is now active
	  act(imgName);
	}
	
	function inactMenuItem(imgName) {
	  isMenuAct = false; // the menu is no longer active
	  if (document.images) {
	    inact(imgName);
	  }
	}
	
	function act(imgName) {
	  if (document.images) 
	    document[imgName].src = eval(imgName + "ON.src");
	}
	
	function inact(imgName) {
	  if (document.images)
	    document[imgName].src = eval(imgName + "OFF.src");
	}