function _HpbImgSwap(imgName, imgSrc)
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=(document.layers && (appVer >= 4));
  var isIE=(document.all    && (appVer >= 4));

  if (isNC || isIE)
  {
    if (document.images)
    {
      var img = document.images[imgName];
      if (!img) img = _HpbImgFind(document, imgName);
      if (img) img.src = imgSrc;
    }
  }
}

function _HpbImgFind(doc, imgName)
{
  for (var i=0; i < doc.layers.length; i++)
  {
    var img = doc.layers[i].document.images[imgName];
    if (!img) img = _HpbImgFind(doc.layers[i], imgName);
    if (img) return img;
  }
  return null;
}
function na_open_window(name, url, left, top, width, height, toolbar, menubar, statusbar, scrollbar, resizable)
{
  toolbar_str = toolbar ? 'yes' : 'no';
  menubar_str = menubar ? 'yes' : 'no';
  statusbar_str = statusbar ? 'yes' : 'no';
  scrollbar_str = scrollbar ? 'yes' : 'no';
  resizable_str = resizable ? 'yes' : 'no';
  window.open(url, name, 'left='+left+',top='+top+',width='+width+',height='+height+',toolbar='+toolbar_str+',menubar='+menubar_str+',status='+statusbar_str+',scrollbars='+scrollbar_str+',resizable='+resizable_str);
}