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     In the following example,we can easy to move the list box item up and down using javascript code.
Example

    function listboxMove(listID, direction) {
      var listbox = document.getElementById(listID);
      var selIndex = listbox.selectedIndex;
      if (-1 == selIndex) {
        alert("Please select an option to move.");
        return;
      }
      var increment = -1;
      if (direction == 'up')
        increment = -1;
      else
        increment = 1;
      if ((selIndex + increment) < 0 ||
        (selIndex + increment) > (listbox.options.length - 1)) {
        return;
      }
      var selValue = listbox.options[selIndex].value;
      var selText = listbox.options[selIndex].text;
      listbox.options[selIndex].value = listbox.options[selIndex + increment].value
      listbox.options[selIndex].text = listbox.options[selIndex + increment].text
      listbox.options[selIndex + increment].value = selValue;
      listbox.options[selIndex + increment].text = selText;
      listbox.selectedIndex = selIndex + increment;
    }


Example Program:- (Editor)


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