var btn=""; var nav=navigator.appName.indexOf("Netscape"); var vers=parseInt(navigator.appVersion);
  if ( (nav != -1 && vers >= 3) || (vers == 4) ) {
    default1 = new Image(); default1.src = "graphics/1a.gif";
    changed1 = new Image(); changed1.src = "graphics/1b.gif";
    default2 = new Image(); default2.src = "graphics/2a.gif";
    changed2 = new Image(); changed2.src = "graphics/2b.gif";
    default3 = new Image(); default3.src = "graphics/3a.gif";
    changed3 = new Image(); changed3.src = "graphics/3b.gif";
    default4 = new Image(); default4.src = "graphics/4a.gif";
    changed4 = new Image(); changed4.src = "graphics/4b.gif";
    default5 = new Image(); default5.src = "graphics/5a.gif";
    changed5 = new Image(); changed5.src = "graphics/5b.gif";
    default6 = new Image(); default6.src = "graphics/6a.gif";
    changed6 = new Image(); changed6.src = "graphics/6b.gif";
    default7 = new Image(); default7.src = "graphics/7a.gif";
    changed7 = new Image(); changed7.src = "graphics/7b.gif";
    default8 = new Image(); default8.src = "graphics/8a.gif";
    changed8 = new Image(); changed8.src = "graphics/8b.gif";
    default9 = new Image(); default9.src = "graphics/music1.gif";
    changed9 = new Image(); changed9.src = "graphics/music2.gif";
    default10 = new Image(); default10.src = "graphics/whisky1.gif";
    changed10 = new Image(); changed10.src = "graphics/whisky2.gif";
    default11 = new Image(); default11.src = "graphics/wildlife1.gif";
    changed11 = new Image(); changed11.src = "graphics/wildlife2.gif";
    default12 = new Image(); default12.src = "graphics/heritage1.gif";
    changed12 = new Image(); changed12.src = "graphics/heritage2.gif";
    default13 = new Image(); default13.src = "graphics/13a.gif";
    changed13 = new Image(); changed13.src = "graphics/13b.gif";
    default14 = new Image(); default14.src = "graphics/skye_treks1.gif";
    changed14 = new Image(); changed14.src = "graphics/skye_treks2.gif";
    default15 = new Image(); default15.src = "graphics/groupsa.gif";
    changed15 = new Image(); changed15.src = "graphics/groupsb.gif";
    default16 = new Image(); default16.src = "graphics/disc_skye1.gif";
    changed16 = new Image(); changed16.src = "graphics/disc_skye2.gif";
}
  function Ichange(p) {
    if ( (nav != -1 && vers >= 3) || (vers == 4) ) {
    var pSrc=eval(p+ ".src");
    document[btn].src = pSrc;
    }
  }