function ImgPreload()
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=(document.layers && (appVer >= 4)); // Netscape Navigator 4.0 or later
  var isIE=(document.all    && (appVer >= 4)); // Internet Explorer  4.0 or later
  if (isNC || isIE)
  {
    if (document.images)
    {
      var imgName = ImgPreload.arguments[0];
      var cnt;
      swImg[imgName] = new Array;
      for (cnt = 1; cnt < ImgPreload.arguments.length; cnt++)
      {
        swImg[imgName][ImgPreload.arguments[cnt]] = new Image();
        swImg[imgName][ImgPreload.arguments[cnt]].src = ImgPreload.arguments[cnt];
      }
    }
  }
}

function ImgSwap(imgName, imgSrc)
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=(document.layers && (appVer >= 4)); // Netscape Navigator 4.0 or later
  var isIE=(document.all    && (appVer >= 4)); // Internet Explorer  4.0 or later
  if (isNC || isIE)
  {
    if (document.images)
    {
      document.images[imgName].src = imgSrc;
    }
  }
}
var swImg; swImg=new Array;
ImgPreload('_Rover1', 'imgs/b_new.gif', 'imgs/b_new1.gif');
ImgPreload('_Rover2', 'imgs/b_tarif.gif', 'imgs/b_tarif1.gif');
ImgPreload('_Rover3', 'imgs/b_visitor.gif', 'imgs/b_visitor1.gif');
ImgPreload('_Rover4', 'imgs/b_etc.gif', 'imgs/b_etc1.gif');
ImgPreload('_Rover5', 'imgs/b_hoken.gif', 'imgs/b_hoken1.gif');
ImgPreload('_Rover6', 'imgs/b_menkyo.gif', 'imgs/b_menkyo1.gif');
ImgPreload('_Rover7', 'imgs/b_srv.gif', 'imgs/b_srv1.gif');
ImgPreload('_Rover8', 'imgs/b_access.gif', 'imgs/b_access1.gif');