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/nav1.gif";
    changed1 = new Image(); changed1.src = "graphics/nav1a.gif";
    default2 = new Image(); default2.src = "graphics/nav2.gif";
    changed2 = new Image(); changed2.src = "graphics/nav2a.gif";
    default3 = new Image(); default3.src = "graphics/nav3.gif";
    changed3 = new Image(); changed3.src = "graphics/nav3a.gif";
    default4 = new Image(); default4.src = "graphics/nav4.gif";
    changed4 = new Image(); changed4.src = "graphics/nav4a.gif";
    default5 = new Image(); default5.src = "graphics/button1.gif";
    changed5 = new Image(); changed5.src = "graphics/button1a.gif";
    default6 = new Image(); default6.src = "graphics/button2.gif";
    changed6 = new Image(); changed6.src = "graphics/button2a.gif";
    default7 = new Image(); default7.src = "graphics/button3.gif";
    changed7 = new Image(); changed7.src = "graphics/button3a.gif";
    default8 = new Image(); default8.src = "graphics/button4.gif";
    changed8 = new Image(); changed8.src = "graphics/button4a.gif";
    default9 = new Image(); default9.src = "graphics/button5.gif";
    changed9 = new Image(); changed9.src = "graphics/button5a.gif";
    default10 = new Image(); default10.src = "graphics/button6.gif";
    changed10 = new Image(); changed10.src = "graphics/button6a.gif";
}
  function Ichange(p) {
    if ( (nav != -1 && vers >= 3) || (vers == 4) ) {
    var pSrc=eval(p+ ".src");
    document[btn].src = pSrc;
    }
  }