var testVer = 0;
    browser_name = navigator.appName;
    browser_version = parseFloat(navigator.appVersion);
    if (browser_name == "Netscape" && browser_version >= 3.0) {
      testVer=1;
    } else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 4.0) {
      testVer=1;
    }
    if (testVer == 1) {
	  anormal = new Image;
      anormal.src = "images/buttons/1-home.gif";
      alight = new Image;
      alight.src = "images/buttons/1-home-over.gif";
	  bnormal = new Image;
      bnormal.src = "images/buttons/2-about.gif";
      blight = new Image;
      blight.src = "images/buttons/2-about-over.gif";
	  cnormal = new Image;
      cnormal.src = "images/buttons/3-books.gif";
      clight = new Image;
      clight.src = "images/buttons/3-books-over.gif";
	  dnormal = new Image;
      dnormal.src = "images/buttons/4-endorsements.gif";
      dlight = new Image;
      dlight.src = "images/buttons/4-endorsements-over.gif";
	  enormal = new Image;
      enormal.src = "images/buttons/5-presentations.gif";
      elight = new Image;
      elight.src = "images/buttons/5-presentations-over.gif";
	  fnormal = new Image;
      fnormal.src = "images/buttons/6-videos.gif";
      flight = new Image;
      flight.src = "images/buttons/6-videos-over.gif";
	  gnormal = new Image;
      gnormal.src = "images/buttons/7-podcasts.gif";
      glight = new Image;
      glight.src = "images/buttons/7-podcasts-over.gif";
	  hnormal = new Image;
      hnormal.src = "images/buttons/8-schedule.gif";
      hlight = new Image;
      hlight.src = "images/buttons/8-schedule-over.gif";
	  inormal = new Image;
      inormal.src = "images/buttons/9-contact.gif";
      ilight = new Image;
      ilight.src = "images/buttons/9-contact-over.gif";
    }
    function doChange( imgName ) {
      if(testVer == 1) {
        document.images[imgName].src = eval(imgName + "light.src");
      }
    }
    function undoChange( imgName ) {
      if(testVer == 1) {
        document.images[imgName].src = eval(imgName + "normal.src");
      }
    }