gistfile1.txt

var $_keydown = function(element, handler, bubble) {
  bubble = bubble || false;
  var boundHandler = function() {
    handler.apply(element, arguments);
  };
  if(element.addEventListener) {
    element.addEventListener('keydown', boundHandler, bubble);
  } else {
    element.attachEvent('onkeydown', boundHandler, bubble);
  }
});