function listboxchange(p_index) {

  //Clear Current options in subcategory
  document.form1.subcategory2.options.length = 0;


  switch (p_index) {

  case "test1.1":
  document.form1.subcategory2.options[0] = new Option("Select Sub-Category2", "");

  document.form1.subcategory2.options[1] = new Option("Test1.1.1", "test1.1.1");

  document.form1.subcategory2.options[2] = new Option("Test1.1.2", "test1.1.2");

  document.form1.subcategory2.options[3] = new Option("Test1.1.3", "test1.1.3");

  break;

  case "test1.2":
  document.form1.subcategory2.options[0] = new Option("Select Sub-Category2", "");

  document.form1.subcategory2.options[1] = new Option("Test1.2.1", "test1.2.1");

  document.form1.subcategory2.options[2] = new Option("Test1.2.2", "test1.2.2");

  break;

  case "test2.1":
  document.form1.subcategory2.options[0] = new Option("Select Sub-Category2", "");

  document.form1.subcategory2.options[1] = new Option("Test2.1.1", "test2.1.1");

  document.form1.subcategory2.options[2] = new Option("Test2.1.2", "test2.1.2");

  break;

  case "test2.2":
  document.form1.subcategory2.options[0] = new Option("Select Sub-Category2", "");

  document.form1.subcategory2.options[1] = new Option("Test2.2.1", "test2.2.1");

  document.form1.subcategory2.options[2] = new Option("Test2.2.2", "test2.2.2");

  break;

  }
  return true;
  }