jQuery Roulette

gistfile1.js

(function(){
    var script = document.createElement('script'),
        major = Math.random() * (2 - 1) + 1 ,
        minor = 0;

    if (major === 1){
        minor = Math.random() * (11 - 0);
    } else {
        minor = Math.random() * (2 - 1) + 1;
    }

    script.type = 'text/javascript';
    script.async = true;
    script.src = 'http://code.jquery.com/jquery-' + Math.floor(major) + '.' + Math.floor(minor) + '.0.js';

    document.getElementsByTagName('head')[0].appendChild(script);
})();