var NN3 = false;
 img = new Array
 image1 = new Image();
 image1.src = "http://www.mig.info/sm4_off.gif";
 image1on = new Image();
 image1on.src = "http://www.mig.info/sm4_on.gif";
 image2 = new Image();
 image2.src = "http://www.mig.info/dk4_off.gif";
 image2on = new Image();
 image2on.src = "http://www.mig.info/dk4_on.gif";
 image3 = new Image();
 image3.src = "http://www.mig.info/as4_off.gif";
 image3on = new Image();
 image3on.src = "http://www.mig.info/as4_on.gif";
 image4 = new Image();
 image4.src = "http://www.mig.info/vk_off.gif";
 image4on = new Image();
 image4on.src = "http://www.mig.info/vk_on.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 = ""
         }