Content Spinning JS

spin.js

function spin(txt){

        var matches = txt.match(/{([^{}]*)}/g);
        if (!matches) return txt;
            for (i in matches) {
                spin = matches[i]+'';
                ori_spin = spin;
                spin = spin.replace("{", "").replace("}", "");
                spin_strs = spin.split('|');
                txt = txt.replace(ori_spin,spin_strs[Math.floor(Math.random() * spin_strs.length)]);
            }
        return spin(txt);
}