agent = navigator.userAgent
browserVer = 2
if (((agent.indexOf("a/3",6))&(agent.indexOf("a/4",6))) == -1) {browserVer = 2}
    else {browserVer = 1}
if (browserVer == 1)
 {buta1 = new Image(25,480); buta1.src = "menu/buta_01.gif";
  buta2 = new Image(25,480); buta2.src = "menu/buta_02.gif";
  buta3 = new Image(25,480); buta3.src = "menu/buta_03.gif";
  buta4 = new Image(25,480); buta4.src = "menu/buta_04.gif";
  buta5 = new Image(25,480); buta5.src = "menu/buta_05.gif";
  buta6 = new Image(25,480); buta6.src = "menu/buta_06.gif";
  buta7 = new Image(25,480); buta7.src = "menu/buta_07.gif";
  buta8 = new Image(25,480); buta8.src = "menu/buta_08.gif";
  buta9 = new Image(25,480); buta9.src = "menu/buta_09.gif";
     
  ona1 = new Image(25,480); ona1.src = "menu/ona_01.gif";
  ona2 = new Image(25,480); ona2.src = "menu/ona_02.gif";
  ona3 = new Image(25,480); ona3.src = "menu/ona_03.gif";
  ona4 = new Image(25,480); ona4.src = "menu/ona_04.gif";
  ona5 = new Image(25,480); ona5.src = "menu/ona_05.gif";
  ona6 = new Image(25,480); ona6.src = "menu/ona_06.gif";
  ona7 = new Image(25,480); ona7.src = "menu/ona_07.gif";
  ona8 = new Image(25,480); ona8.src = "menu/ona_08.gif";
  ona9 = new Image(25,480); ona9.src = "menu/ona_09.gif";
}
function SwitchOn (ButName)
{if (browserVer == 1)
 {document.images[ButName].src=eval("on"+ButName+".src");
window.status=""}};
function SwitchOff (ButName){if (browserVer == 1)
 {document.images[ButName].src=eval("but"+ButName+".src");
window.status=""}};