var random = Math.floor(Math.random()*10000000);

var include = '<script type="text/javascript" src="/on/js/jquery-1.2.6.pack.js"></script>';
include += '<script type="text/javascript" src="/on/js/sifr.js"></script>';
include += '<script type="text/javascript" src="/on/js/commons.js?random='+random+'"></script>';
document.write(include);