text: //List of files which are indexed.
  fl = new Array();
  fl["0"]= "ch01.html";
  fl["1"]= "ch02.html";
  fl["2"]= "ch02s01.html";
  fl["3"]= "ch02s02.html";
  fl["4"]= "ch02s03.html";
  fl["5"]= "ch02s04.html";
  fl["6"]= "ch03.html";
  fl["7"]= "ch03s01.html";
  fl["8"]= "ch03s02.html";
  