Return value from showModalDialog

<script type='text/javascript'>
  var getSelectedText = function(editor) {
    var selectedText = '';
    var selection = editor.getSelection();
    if (selection.getType() == window.opener.CKEDITOR.SELECTION_TEXT) {
      if (window.opener.CKEDITOR.env.ie) {
        selection.unlock(true);
        selectedText = selection.getNative().createRange().text;
      } else {
        selectedText = selection.getNative();
      }
    }
    return(selectedText);
  }

  var selectedText = getSelectedText(window.opener.CKEDITOR.instances.content);
  window.opener.CKEDITOR.instances.content.insertHtml('<span id="$tooltipDomId" class="$tooltipClassName">' + selectedText + '</span>');
</script>