if (Object.prototype.toSource) {
    function toSource(o) { return o.toSource(); }
} else {
    function toSource(o) {
        switch(typeof o) {
            case "object":
                if (o instanceof Array) {
                    var result = [];
                    for (var i = 0, l = o.length; i < l; ++i) {
                        result.push(toSource(o[i]));
                    }
                    return "[" + result.join(",") + "]";
                } else {
                    var result = [];
                    for (var prop in o) {
                        result.push(prop + ":" + toSource(o[prop]));
                    }
                }
                return "{" + result.join(",") + "}";    
            break;
            case "string": 
                return '"' + o + '"';
            break;
            default:
                return o.toString();
        }
    }
}