if (document.images)
	{
     elo_a= new Image(122,29);
     elo_a.src="but/1_2.jpg";  
     proj_a= new Image(122,29);
     proj_a.src="but/2_2.jpg";
	 nayt_a= new Image(122,29);
     nayt_a.src="but/3_2.jpg";  
	 tot_a= new Image(122,29);
     tot_a.src="but/4_2.jpg";  
	 mat_a= new Image(122,29);
     mat_a.src="but/5_2.jpg";
	 pres_a= new Image(122,29);
     pres_a.src="but/6_2.jpg";  
	 tuk_a= new Image(122,29);
     tuk_a.src="but/7_2.jpg";  
	 yht_a= new Image(122,29);
    yht_a.src="but/8_2.jpg";  
	 etu_a= new Image(122,29);
     etu_a.src="but/9_2.jpg";   

     elo_b= new Image(122,29);
     elo_b.src="but/1_1.jpg";  
     proj_b= new Image(122,29);
     proj_b.src="but/2_1.jpg";
	 nayt_b= new Image(122,29);
     nayt_b.src="but/3_1.jpg";  
	 tot_b= new Image(122,29);
     tot_b.src="but/4_1.jpg";  
	 mat_b= new Image(122,29);
     mat_b.src="but/5_1.jpg"; 
	 pres_b= new Image(122,29);
     pres_b.src="but/6_1.jpg";  
	 tuk_b= new Image(122,29);
     tuk_b.src="but/7_1.jpg";  
	 yht_b= new Image(122,29);
     yht_b.src="but/8_1.jpg";  
	 etu_b= new Image(122,29);
     etu_b.src="but/9_1.jpg";   
   }

function on(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "_" + "a.src");
      document[imgName].src= imgOn;
    }
 }

function off(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "_" + "b.src");
      document[imgName].src= imgOff;
    }
 }