rem: this.prev_onclick(); 
add: this.prev_onclick(); 
context:           element.onclick = function() {            this.prev_onclick();             this.target.onElementEvent();          }
meta: 1331	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1331/9867ca01ad65827d23c0bf6cc14d8a64137e927d/prototype.js/clean/tracks/public/javascripts/prototype.js