if (typeof responder[callback] == 'function') { 
if (Object.isFunction(responder[callback])) { 
  dispatch: function(callback, request, transport, json) {    this.each(function(responder) {      if (typeof responder[callback] == 'function') {        try {          responder[callback].apply(responder, [request, transport, json]);        } catch (e) {}      }    });  }
4999	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4999/0c67d2a1c175fa312f232b827bd1c26b95eac0e1/prototype.js/clean/wp-includes/js/prototype.js