rem: var old = this._pollEvent; this._pollEvent = function(first) 
add: var old = ajax._pollEvent; ajax._pollEvent = function(first) 
context:   addPollHandler : function(func)  {    var old = this._pollEvent;    this._pollEvent = function(first)     {      old(first);      func(first);    }  },
meta: 9683	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9683/05cb7c631f35e89f0ac416f3ea0b156415fbb413/ajax.js/buggy/trunk/examples/test-webapp/src/main/webapp/js/ajax.js