// HpbImgPreload
function HpbImgPreload()
{
  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 = HpbImgPreload.arguments[0];
      var cnt;
      swImg[imgName] = new Array;
      for (cnt = 1; cnt < HpbImgPreload.arguments.length; cnt++)
      {
        swImg[imgName][HpbImgPreload.arguments[cnt]] = new Image();
        swImg[imgName][HpbImgPreload.arguments[cnt]].src = HpbImgPreload.arguments[cnt];
      }
    }
  }
}
// HpbImgSwap
function HpbImgSwap(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;
// RollOver
HpbImgPreload('_HPB_ROLLOVER01', 'about/image/bnr_1.gif', 'about/image/bnr_1on.gif');
HpbImgPreload('_HPB_ROLLOVER02', 'about/image/bnr_2.gif', 'about/image/bnr_2on.gif');
HpbImgPreload('_HPB_ROLLOVER03', 'about/image/bnr_3.gif', 'about/image/bnr_3on.gif');
HpbImgPreload('_HPB_ROLLOVER04', 'about/image/bnr_4.gif', 'about/image/bnr_4on.gif');