/**
 * Get the text selection in a textarea.
 */
Drupal.getSelection = function (element) {
  if (typeof(element.selectionStart) != 'number' && document.selection) {
    // The current selection
    var range1 = document.selection.createRange();
    var range2 = range1.duplicate();
    // Select all text.
    range2.moveToElementText(element);
    // Now move 'dummy' end point to end point of original range.
    range2.setEndPoint('EndToEnd', range1);
    // Now we can calculate start and end points.
    var start = range2.text.length - range1.text.length;
    var end = start + range1.text.length;
    return { 'start': start, 'end': end };
  }
  return { 'start': element.selectionStart, 'end': element.selectionEnd };
};