Simple utility to get selected text in a page

gistfile1.js

;(function(win,doc){
  
  function _getSelectedText (){
    _getSelectedText = win.getSelection ? // redefine itself when first run
      win.getSelection :
        doc.getSelection ?
          doc.getSelection:
          doc.selection ?
            function(){return doc.selection.createRange().text;} :
            function(){return '';};
  
    return _getSelectedText();
  }
  
  function _deselectText() {
    _deselectText = win.getSelection ? // redefine itself when first run
      function(){win.getSelection().removeAllRanges();} :
      doc.getSelection ?
        function(){doc.getSelection().removeAllRanges();} :
        doc.selection ?
          function(){doc.selection.empty();} :
          function(){};
    return _deselectText();
  }
  
})(window, document);