rem: function() {return new XMLHttpRequest()} 
add: return this.select(function(value) { return value != undefined || value != null; }); 
context:       function() {return new XMLHttpRequest()}
meta: 3991	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3991/d29159eae8749c508d01bb447868321a3ba6bbfa/prototype.js/buggy/manager/media/script/scriptaculous/prototype.js