function ImgLoad()
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=false,isN6=false,isIE=false;
  if (document.all && appVer >= 4) isIE=true; else
    if (document.getElementById && appVer > 4) isN6=true; else
      if (document.layers && appVer >= 4) isNC=true;
  if (isNC||isN6||isIE)
  {
    if (document.images)
    {
      var imgName = ImgLoad.arguments[0];
      var cnt;
      swImg[imgName] = new Array;
      for (cnt = 1; cnt < ImgLoad.arguments.length; cnt++)
      {
        swImg[imgName][ImgLoad.arguments[cnt]] = new Image();
        swImg[imgName][ImgLoad.arguments[cnt]].src = ImgLoad.arguments[cnt];
      }
    }
  }
}
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=false,isN6=false,isIE=false;
  if (document.all && appVer >= 4) isIE=true; else
    if (document.getElementById && appVer > 4) isN6=true; else
      if (document.layers && appVer >= 4) isNC=true;
  if (isNC||isN6||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;

ImgLoad('OVER1', 'image/top_l.gif', 'image/top_lb.gif  ');
ImgLoad('OVER2', 'image/bird_l_1.gif', 'image/bird_l_2.gif');
ImgLoad('OVER3', 'image/bird_r_1.gif', 'image/bird_r_2.gif');
ImgLoad('OVER4', 'image/blog_buton_white.gif', 'image/blog_buton_black.gif');
ImgLoad('OVER5', 'image/MianVisual_v2a_06.gif', 'image/MianVisual_v2a_06over.gif');
ImgLoad('OVER6', 'image/MianVisual_v2a_08.gif', 'image/MianVisual_v2a_08over.gif');
ImgLoad('OVER7', 'image/MianVisual_v2a_10.gif', 'image/MianVisual_v2a_10over.gif');
ImgLoad('OVER8', 'image/copyright2010b.gif', 'image/copyright2010.gif');