rem: cb(status); 
add: if (typeof cb == "function") cb(status); 
context:     function reloadCB (status)    {        sourceRec.invalidate();        cb(status);    }
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/0aa85ea12fc2527490368baea23f07a426583f1d/venkman-static.js/buggy/extensions/venkman/resources/content/venkman-static.js