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/**
 * @source: http://whattheheadsaid.com/2010/10/a-safer-object-keys-compatibility-implementation
 */
Object.keys = Object.keys || (function () {
    var hasOwnProperty = Object.prototype.hasOwnProperty,
        hasDontEnumBug = !{toString:null}.propertyIsEnumerable("toString"),
        DontEnums = [
            'toString',
            'toLocaleString',
            'valueOf',
            'hasOwnProperty',
            'isPrototypeOf',
            'propertyIsEnumerable',
            'constructor'
        ],
        DontEnumsLength = DontEnums.length;
  
    return function (o) {
        if (typeof o != "object" && typeof o != "function" || o === null)
            throw new TypeError("Object.keys called on a non-object");
     
        var result = [];
        for (var name in o) {
            if (hasOwnProperty.call(o, name))
                result.push(name);
        }
     
        if (hasDontEnumBug) {
            for (var i = 0; i < DontEnumsLength; i++) {
                if (hasOwnProperty.call(o, DontEnums[i]))
                    result.push(DontEnums[i]);
            }  
        }
     
        return result;
    };
})();