function fnKeyDownHandler(getdropdown, e)
  {
    fnSanityCheck(getdropdown);

    // Press [ <- ] and [ -> ] arrow keys on the keyboard to change alignment/flow.
    // ...go to Start : Press  [ <- ] Arrow Key
    // ...go to End : Press [ -> ] Arrow Key
    // (this is useful when the edited-text content exceeds the ListBox-fixed-width)
    // This works best on Internet Explorer, and not on Netscape

    var vEventKeyCode = FindKeyCode(e);

    // Press left/right arrow keys
    if(vEventKeyCode == 37)
    {
    fnLeftToRight(getdropdown);
    }
    if(vEventKeyCode == 39)
    {
    fnRightToLeft(getdropdown);
    }

    // Delete key pressed
    if(vEventKeyCode == 46)
    {
    fnDelete(getdropdown);
    }

    // backspace key pressed
    if(vEventKeyCode == 8 || vEventKeyCode==127)
    {
    if(e.which) //Netscape
    {
      //e.which = ''; //this property has only a getter.
    }
    else //Internet Explorer
    {
      //To prevent backspace from activating the -Back- button of the browser
      e.keyCode = '';
      if(window.event.keyCode)
      {
      window.event.keyCode = '';
      }
    }
    return true;
    }

    // Tab key pressed, use code below to reorient to Left-To-Right flow, if needed
    //if(vEventKeyCode == 9)
    //{
    //  fnLeftToRight(getdropdown);
    //}
  }

  function fnLeftToRight(getdropdown)
  {
    getdropdown.style.direction = "ltr";
  }

  function fnRightToLeft(getdropdown)
  {
    getdropdown.style.direction = "rtl";
  }

  function fnDelete(getdropdown)
  {
    if(getdropdown.options.length != 0)
    // if dropdown is not empty
    {
    if (getdropdown.options.selectedIndex == vEditableOptionIndex_A)
    // if option the Editable field
    {
      getdropdown.options[getdropdown.options.selectedIndex].text = '';
      getdropdown.options[getdropdown.options.selectedIndex].value = ''; //Use this line only if want to change the internal value too; else this line is not required.
    }
    }
  }


  function FindKeyCode(e)
  {
    if(e.which)
    {
    keycode=e.which;  //Netscape
    }
    else
    {
    keycode=e.keyCode; //Internet Explorer
    }

    return keycode;
  }

  function FindKeyChar(e)
  {
    keycode = FindKeyCode(e);
    if((keycode==8)||(keycode==127))
    {
    character="backspace"
    }
    else if((keycode==46))
    {
    character="delete"
    }
    else
    {
    character=String.fromCharCode(keycode);
    }

    return character;
  }

  function fnSanityCheck(getdropdown)
  {
    if(vEditableOptionIndex_A>(getdropdown.options.length-1))
    {
    alert("PROGRAMMING ERROR: The value of variable vEditableOptionIndex_... cannot be greater than (length of dropdown - 1)");
    return false;
    }
  }

  /*----------------------------------------------
  Dropdown specific global variables are:
  -----------------------------------------------
  1) vEditableOptionIndex_A   --> this needs to be set by Programmer!! See explanation.
  2) vEditableOptionText_A    --> this needs to be set by Programmer!! See explanation.
  3) vPreviousSelectIndex_A
  4) vSelectIndex_A
  5) vSelectChange_A

  --------------------------- Subrata Chakrabarty */

  /*----------------------------------------------
  The dropdown specific functions
  (which manipulate dropdown specific global variables)
  used by all dropdowns are:
  -----------------------------------------------
  1) function fnChangeHandler_A(getdropdown)
  2) function fnKeyPressHandler_A(getdropdown, e)
  3) function fnKeyUpHandler_A(getdropdown, e)

  --------------------------- Subrata Chakrabarty */

  /*------------------------------------------------
  IMPORTANT: Global Variable required to be SET by programmer
  -------------------------- Subrata Chakrabarty  */

  var vEditableOptionIndex_A = 0;

  // Give Index of Editable option in the dropdown.
  // For eg.
  // if first option is editable then vEditableOptionIndex_A = 0;
  // if second option is editable then vEditableOptionIndex_A = 1;
  // if third option is editable then vEditableOptionIndex_A = 2;
  // if last option is editable then vEditableOptionIndex_A = (length of dropdown - 1).
  // Note: the value of vEditableOptionIndex_A cannot be greater than (length of dropdown - 1)

  var vEditableOptionText_A = "Add Category";
  
  // Give the default text of the Editable option in the dropdown.
  // For eg.
  // if the editable option is <option ...>--?--</option>,
  // then set vEditableOptionText_A = "--?--";

  /*------------------------------------------------
  Global Variables required for
  fnChangeHandler_A(), fnKeyPressHandler_A() and fnKeyUpHandler_A()
  for Editable Dropdowns
  -------------------------- Subrata Chakrabarty  */

  var vPreviousSelectIndex_A = 0;
  // Contains the Previously Selected Index, set to 0 by default

  var vSelectIndex_A = 0;
  // Contains the Currently Selected Index, set to 0 by default

  var vSelectChange_A = 'MANUAL_CLICK';
  // Indicates whether Change in dropdown selected option
  // was due to a Manual Click
  // or due to System properties of dropdown.

  // vSelectChange_A = 'MANUAL_CLICK' indicates that
  // the jump to a non-editable option in the dropdown was due
  // to a Manual click (i.e.,changed on purpose by user).

  // vSelectChange_A = 'AUTO_SYSTEM' indicates that
  // the jump to a non-editable option was due to System properties of dropdown
  // (i.e.,user did not change the option in the dropdown;
  // instead an automatic jump happened due to inbuilt
  // dropdown properties of browser on typing of a character )

  /*------------------------------------------------
  Functions required for  Editable Dropdowns
  -------------------------- Subrata Chakrabarty  */

  function fnChangeHandler_A(getdropdown)
  {
    fnSanityCheck(getdropdown);

    vPreviousSelectIndex_A = vSelectIndex_A;
    // Contains the Previously Selected Index

    vSelectIndex_A = getdropdown.options.selectedIndex;
    // Contains the Currently Selected Index

    if ((vPreviousSelectIndex_A == (vEditableOptionIndex_A)) && (vSelectIndex_A != (vEditableOptionIndex_A))&&(vSelectChange_A != 'MANUAL_CLICK'))
    // To Set value of Index variables - Subrata Chakrabarty
    {
      getdropdown[(vEditableOptionIndex_A)].selected=true;
      vPreviousSelectIndex_A = vSelectIndex_A;
      vSelectIndex_A = getdropdown.options.selectedIndex;
      vSelectChange_A = 'MANUAL_CLICK';
      // Indicates that the Change in dropdown selected
      // option was due to a Manual Click
    }
  }

  function fnKeyPressHandler_A(getdropdown, e)
  {
    fnSanityCheck(getdropdown);

    keycode = FindKeyCode(e);
    keychar = FindKeyChar(e);

    // Check for allowable Characters
    // The various characters allowable for entry into Editable option..
    // may be customized by minor modifications in the code (if condition below)
    // (you need to know the keycode/ASCII value of the  character to be allowed/disallowed.
    // - Subrata Chakrabarty

    if ((keycode>47 && keycode<59)||(keycode>62 && keycode<127) ||(keycode==32))
    {
      var vAllowableCharacter = "yes";
    }
    else
    {
      var vAllowableCharacter = "no";
    }

    if(getdropdown.options.length != 0)
    // if dropdown is not empty
      if (getdropdown.options.selectedIndex == (vEditableOptionIndex_A))
      // if selected option the Editable option of the dropdown
      {

        var vEditString = getdropdown[vEditableOptionIndex_A].text;

        // make Editable option Null if it is being edited for the first time
        if((vAllowableCharacter == "yes")||(keychar=="backspace"))
        {
          if (vEditString == vEditableOptionText_A)
            vEditString = "";
        }
        if (keychar=="backspace")
        // To handle backspace - Subrata Chakrabarty
        {
          vEditString = vEditString.substring(0,vEditString.length-1);
          // Decrease length of string by one from right

          vSelectChange_A = 'MANUAL_CLICK';
          // Indicates that the Change in dropdown selected
          // option was due to a Manual Click

        }

        if (vAllowableCharacter == "yes")
        // To handle addition of a character - Subrata Chakrabarty
        {
          vEditString+=String.fromCharCode(keycode);
          // Concatenate Enter character to Editable string

          // The following portion handles the "automatic Jump" bug
          // The "automatic Jump" bug (Description):
          //   If a alphabet is entered (while editing)
          //   ...which is contained as a first character in one of the read-only options
          //   ..the focus automatically "jumps" to the read-only option
          //   (-- this is a common property of normal dropdowns
          //    ..but..is undesirable while editing).

          var i=0;
          var vEnteredChar = String.fromCharCode(keycode);
          var vUpperCaseEnteredChar = vEnteredChar;
          var vLowerCaseEnteredChar = vEnteredChar;


          if(((keycode)>=97)&&((keycode)<=122))
          // if vEnteredChar lowercase
            vUpperCaseEnteredChar = String.fromCharCode(keycode - 32);
            // This is UpperCase


          if(((keycode)>=65)&&((keycode)<=90))
          // if vEnteredChar is UpperCase
            vLowerCaseEnteredChar = String.fromCharCode(keycode + 32);
            // This is lowercase

          if(e.which) //For Netscape
          {
            // Compare the typed character (into the editable option)
            // with the first character of all the other
            // options (non-editable).

            // To note if the jump to the non-editable option was due
            // to a Manual click (i.e.,changed on purpose by user)
            // or due to System properties of dropdown
            // (i.e.,user did not change the option in the dropdown;
            // instead an automatic jump happened due to inbuilt
            // dropdown properties of browser on typing of a character )

            for (i=0;i<=(getdropdown.options.length-1);i++)
            {
              if(i!=vEditableOptionIndex_A)
              {
                var vReadOnlyString = getdropdown[i].text;
                var vFirstChar = vReadOnlyString.substring(0,1);
                if((vFirstChar == vUpperCaseEnteredChar)||(vFirstChar == vLowerCaseEnteredChar))
                {
                  vSelectChange_A = 'AUTO_SYSTEM';
                  // Indicates that the Change in dropdown selected
                  // option was due to System properties of dropdown
                  break;
                }
                else
                {
                  vSelectChange_A = 'MANUAL_CLICK';
                  // Indicates that the Change in dropdown selected
                  // option was due to a Manual Click
                }
              }
            }
          }
        }

        // Set the new edited string into the Editable option
        getdropdown.options[vEditableOptionIndex_A].text = vEditString;
        getdropdown.options[vEditableOptionIndex_A].value = vEditString; //Use this line only if want to change the internal value too; else this line is not required.

        return false;
      }
    return true;
  }

  function fnKeyUpHandler_A(getdropdown, e)
  {
    fnSanityCheck(getdropdown);

    if(e.which) // Netscape
    {
      if(vSelectChange_A == 'AUTO_SYSTEM')
      {
        // if editable dropdown option jumped while editing
        // (due to typing of a character which is the first character of some other option)
        // then go back to the editable option.
        getdropdown[(vEditableOptionIndex_A)].selected=true;
      }

      var vEventKeyCode = FindKeyCode(e);
      // if [ <- ] or [ -> ] arrow keys are pressed, select the editable option
      if((vEventKeyCode == 37)||(vEventKeyCode == 39))
      {
        getdropdown[vEditableOptionIndex_A].selected=true;
      }
    }
  }