function ImgPreload()
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=(document.layers && (appVer >= 4));
  var isIE=(document.all    && (appVer >= 4));
  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];
      }
    }
  }
}
// ImgFind:
//
function ImgFind(doc, imgName)
{
  for (var i=0; i < doc.layers.length; i++)
  {
    var img = doc.layers[i].document.images[imgName];
    if (!img) img = ImgFind(doc.layers[i], imgName);
    if (img) return img;
  }
  return null;
}
function ImgSwap(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 = ImgFind(document, imgName);
      if (img) img.src = imgSrc;
    }
  }
}
var swImg; swImg=new Array;
ImgPreload('OVER1', 'gifs/i4.gif', 'gifs/i4-r.gif');
ImgPreload('OVER2', 'gifs/i2.gif', 'gifs/i2-r.gif');
ImgPreload('OVER3', 'gifs/i1.gif', 'gifs/i1-r.gif');
ImgPreload('OVER5', 'gifs/i4.gif', 'gifs/i4-r.gif');
ImgPreload('OVER6', 'gifs/i2.gif', 'gifs/i2-r.gif');
ImgPreload('OVER7', 'gifs/i1.gif', 'gifs/i1-r.gif');
ImgPreload('OVER8', 'gifs/i3.gif', 'gifs/i3-r.gif');