rem: this.prev_onclick(); 
add: this.prev_onclick(); 
context:           element.onclick = function() {            this.prev_onclick();             this.target.onElementEvent();          }
meta: 1868	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1868/3f913f897829fb026ef98df2d57f8da94ee5339d/prototype.js/buggy/public/javascripts/prototype.js