var bt_img  = new Array (30)
 agent = navigator.userAgent;

 browser_ver = 0
 
 if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) == 3)
        { browser_ver = 4 }
 else if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) == 4)
        { browser_ver = 4 }
 else if (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) == 4)
        { browser_ver = 4}
 
 if (browser_ver == 4){
     bt_img[0] = new Image (139,32); bt_img[0].src = "images/rus1.gif"
     bt_img[1] = new Image (139,32); bt_img[1].src = "images/english1.gif"
  }
 function release( num ) {
   if (browser_ver == 4){
 if(num == 0)  document.bt0.src  = "images/rus.gif"
 if(num == 1)  document.bt1.src  = "images/english.gif"
   }
   return true;
 }

 function press( num ){
  if (browser_ver == 4){
if(num == 0) document.bt0.src = bt_img[0].src
if(num == 1) document.bt1.src = bt_img[1].src
  }
 }