<!--
  browsok = (((navigator.appName == "Netscape")
  && (parseInt(navigator.appVersion) >= 3))
  || ((navigator.appName == "Microsoft Internet Explorer")
  && (parseInt(navigator.appVersion)>=3)));
  if(browsok){
    // MouseOn   
    // Note: the WWW is for the WIDTH, HHH is for the HEIGHT
 
       chapter131 = new Image(100, 86);
       chapter131.src = "images/chapter_13_on.jpg";
       chapter141 = new Image(100, 86);
       chapter141.src = "images/chapter_14_on.jpg";
       chapter151 = new Image(100, 86);
       chapter151.src = "images/chapter_15_on.jpg";
       chapter161 = new Image(100, 86);
       chapter161.src = "images/chapter_16_on.jpg";
       chapter171 = new Image(100, 86);
       chapter171.src = "images/chapter_17_on.jpg";
       chapter181 = new Image(100, 86);
       chapter181.src = "images/chapter_18_on.jpg";



    // MouseOff

       chapter130 = new Image(100, 86);
       chapter130.src = "images/chapter_13_off.jpg";
       chapter140 = new Image(100, 86);
       chapter140.src = "images/chapter_14_off.jpg";
       chapter150 = new Image(100, 86);
       chapter150.src = "images/chapter_15_off.jpg";
       chapter160 = new Image(100, 86);
       chapter160.src = "images/chapter_16_off.jpg";
       chapter170 = new Image(100, 86);
       chapter170.src = "images/chapter_17_off.jpg";
       chapter180 = new Image(100, 86);
       chapter180.src = "images/chapter_18_off.jpg";


      
  }
  function BNB_mouseon(n){
       if(browsok){
            imageON = eval(n + "1.src");
            document [n].src = imageON;
            }
  }
  function BNB_mouseoff(n){
       if(browsok){
  imageOFF = eval(n + "0.src");
       document [n].src = imageOFF;
            }
  }
  // -->