sampling code for zhidao

gistfile1.js

var isPicked = function(rate) {
    var id = baidu.cookie.get('BAIDUID');
    if (!id) { return false; }
    id = id.replace(/:.*/, '');
    for (var i = 0, l = id.length, sum = 0; i < l; i++) {
        sum += id.charCodeAt(i);
    }   
    return (sum % 100 < rate);
};
if (isPicked(30)) {
    var _bdhmProtocol = (("https:" == document.location.protocol) ? " https://" : " http://");
    document.write(unescape("%3Cscript src='" + _bdhmProtocol + "hm.baidu.com/h.js%3Fced1e79e7fa08b57cae5394a93748264' type='text/javascript'%3E%3C/script%3E"));
}