var NN3 = false;
 var img = new Array
 var image1 = new Image();
 image1.src = "images/01off.gif";
 var image1on = new Image();
 image1on.src = "images/01on.gif";
 var image2 = new Image();
 image2.src = "images/02off.gif";
 var image2on = new Image();
 image2on.src = "images/02on.gif";
 var image3 = new Image();
 image3.src = "images/03off.gif";
 var image3on = new Image();
 image3on.src = "images/03on.gif";
 var image4 = new Image();
 image4.src = "images/04off.gif";
 var image4on = new Image();
 image4on.src = "images/04on.gif";

 function on3(name)   {
         document[name].src = eval(name + "on.src");
 }
 function off3(name)  {
         document[name].src = eval(name + ".src");
 }
 NN3 = true;
 function on(name)  {
         if (NN3) on3(name);
 }
 function off(name)  {
         if (NN3) off3(name);
 }
 function a(txt) {
         self.status = txt
 }
 function b() {
         self.status = ""
 }