rem: this.prev_onchange(); 
add: this.prev_onchange(); 
context:           element.onchange = function() {            this.prev_onchange();            this.target.onElementEvent();          }
meta: 1782	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1782/3f0bcc29b1d13b6ec87c6b75980c7f271e175e80/prototype.js/buggy/webapp/sandbox/scripts/prototype.js