code: function addEvent(obj, evt, func){
      var a;
  
      // Sensible browsers use `addEventListener`
      if((a = obj.addEventListener)){
        a.call(obj, evt, func, false);
  
      // IE uses `attachEvent`
      }else{
        obj.attachEvent('on' + evt, func);
      }
    }
docs: ## addEvent
  
  Helper function for binding DOM events
  
  @param {Element} obj The DOM element to bind to
  @param {string} evt The name of the event to bind to
  @param {function} func Listener to attach to the event