b1On=new Image;
b1On.src="img/b12.jpg";
b1Off=new Image;
b1Off.src="img/b11.jpg";

b2On=new Image;
b2On.src="img/b22.jpg";
b2Off=new Image;
b2Off.src="img/b21.jpg";

b3On=new Image;
b3On.src="img/b32.jpg";
b3Off=new Image;
b3Off.src="img/b31.jpg";

b4On=new Image;
b4On.src="img/b42.jpg";
b4Off=new Image;
b4Off.src="img/b41.jpg";

b5On=new Image;
b5On.src="img/b52.jpg";
b5Off=new Image;
b5Off.src="img/b51.jpg";

	 function swichOn(imgName){
      imgOn = eval(imgName + "On.src");
      document [imgName].src=imgOn;
     }

     function swichOff(imgName){
      imgOff = eval(imgName + "Off.src");
      document [imgName].src = imgOff;
     }