rem: unregister: function(responderToRemove) { this.responders = this.responders.without(responderToRemove); 
add: unregister: function(responder) { this.responders = this.responders.without(responder); 
context:   unregister: function(responderToRemove) {    this.responders = this.responders.without(responderToRemove);  },
meta: 2801	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/2801/7e143d2df37946a5416f0f043869478087652eb6/prototype.js/clean/examples/testcases/prototype.js