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  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
 
       chapter191 = new Image(100, 86);
       chapter191.src = "images/chapter_19_on.jpg";
       chapter201 = new Image(100, 86);
       chapter201.src = "images/chapter_20_on.jpg";
       chapter211 = new Image(100, 86);
       chapter211.src = "images/chapter_21_on.jpg";
       chapter221 = new Image(100, 86);
       chapter221.src = "images/chapter_22_on.jpg";
       chapter231 = new Image(100, 86);
       chapter231.src = "images/chapter_23_on.jpg";
       chapter241 = new Image(100, 86);
       chapter241.src = "images/chapter_24_on.jpg";

       chapter251 = new Image(100, 86);
       chapter251.src = "images/chapter_25_on.jpg";
       chapter261 = new Image(100, 86);
       chapter261.src = "images/chapter_26_on.jpg";
       chapter271 = new Image(100, 86);
       chapter271.src = "images/chapter_27_on.jpg";



    // MouseOff

       chapter190 = new Image(100, 86);
       chapter190.src = "images/chapter_19_off.jpg";
       chapter200 = new Image(100, 86);
       chapter200.src = "images/chapter_20_off.jpg";
       chapter210 = new Image(100, 86);
       chapter210.src = "images/chapter_21_off.jpg";
       chapter220 = new Image(100, 86);
       chapter220.src = "images/chapter_22_off.jpg";
       chapter230 = new Image(100, 86);
       chapter230.src = "images/chapter_23_off.jpg";
       chapter240 = new Image(100, 86);
       chapter240.src = "images/chapter_24_off.jpg";

       chapter250 = new Image(100, 86);
       chapter250.src = "images/chapter_25_off.jpg";
       chapter260 = new Image(100, 86);
       chapter260.src = "images/chapter_26_off.jpg";
       chapter270 = new Image(100, 86);
       chapter270.src = "images/chapter_27_off.jpg";


      
  }
  function BNB_mouseon(n){
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            imageON = eval(n + "1.src");
            document [n].src = imageON;
            }
  }
  function BNB_mouseoff(n){
       if(browsok){
  imageOFF = eval(n + "0.src");
       document [n].src = imageOFF;
            }
  }
  // -->