function JsonToString(o) {   
    var arr = [];
    var fmt = function(s) {
        if (typeof s == 'object' && s != null) return JsonToStr(s);
        return /^(string|number)$/.test(typeof s) ? "'" + s + "'" : s;
    }
    for (var i in o)
         arr.push("'" + i + "':" + fmt(o[i]));
    return '{' + arr.join(',') + '}';
}