function accendi(imgName) {
             if (version == "n3") {
             imgOn = eval(imgName + "on.src");
             document [imgName].src = imgOn;
		 return true;
             }
     }

     function spegni(imgName) {
             if (version == "n3") {
             imgOff = eval(imgName + "off.src");
             document [imgName].src = imgOff;
		 return true;             
	}
     		}

     function premi(imgName) {
             if (version == "n3") {
             imgdown = eval(imgName + "down.src");
             document [imgName].src = imgdown;
		 return true;
             }

     }