if (!this.JSON) {

	// Create a JSON object only if one does not already exist. We create the
	// object in a closure to avoid creating global variables.

	JSON = function() {

		function f(n) {
			// Format integers to have at least two digits.
			return n < 10 ? '0' + n : n;
		}

		Date.prototype.toJSON = function(key) {

			return this.getUTCFullYear() + '-' +
                 f(this.getUTCMonth() + 1) + '-' +
                 f(this.getUTCDate()) + 'T' +
                 f(this.getUTCHours()) + ':' +
                 f(this.getUTCMinutes()) + ':' +
                 f(this.getUTCSeconds()) + 'Z';
		};

		var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
            escapeable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
            gap,
            indent,
            meta = {    // table of character substitutions
            	'\b': '\\b',
            	'\t': '\\t',
            	'\n': '\\n',
            	'\f': '\\f',
            	'\r': '\\r',
            	'"': '\\"',
            	'\\': '\\\\'
            },
            rep;


		function quote(string) {

			// If the string contains no control characters, no quote characters, and no
			// backslash characters, then we can safely slap some quotes around it.
			// Otherwise we must also replace the offending characters with safe escape
			// sequences.

			escapeable.lastIndex = 0;
			return escapeable.test(string) ?
                '"' + string.replace(escapeable, function(a) {
                	var c = meta[a];
                	if (typeof c === 'string') {
                		return c;
                	}
                	return '\\u' + ('0000' +
                            (+(a.charCodeAt(0))).toString(16)).slice(-4);
                }) + '"' :
                '"' + string + '"';
		}


		function str(key, holder) {

			// Produce a string from holder[key].

			var i,          // The loop counter.
                k,          // The member key.
                v,          // The member value.
                length,
                mind = gap,
                partial,
                value = holder[key];

			// If the value has a toJSON method, call it to obtain a replacement value.

			if (value && typeof value === 'object' &&
                    typeof value.toJSON === 'function') {
				value = value.toJSON(key);
			}

			// If we were called with a replacer function, then call the replacer to
			// obtain a replacement value.

			if (typeof rep === 'function') {
				value = rep.call(holder, key, value);
			}

			// What happens next depends on the value's type.

			switch (typeof value) {
				case 'string':
					return quote(value);

				case 'number':

					// JSON numbers must be finite. Encode non-finite numbers as null.

					return isFinite(value) ? String(value) : 'null';

				case 'boolean':
				case 'null':

					// If the value is a boolean or null, convert it to a string. Note:
					// typeof null does not produce 'null'. The case is included here in
					// the remote chance that this gets fixed someday.

					return String(value);

					// If the type is 'object', we might be dealing with an object or an array or
					// null.

				case 'object':

					// Due to a specification blunder in ECMAScript, typeof null is 'object',
					// so watch out for that case.

					if (!value) {
						return 'null';
					}

					// Make an array to hold the partial results of stringifying this object value.

					gap += indent;
					partial = [];

					// If the object has a dontEnum length property, we'll treat it as an array.

					if (typeof value.length === 'number' &&
                        !(value.propertyIsEnumerable('length'))) {

						// The object is an array. Stringify every element. Use null as a placeholder
						// for non-JSON values.

						length = value.length;
						for (i = 0; i < length; i += 1) {
							partial[i] = str(i, value) || 'null';
						}

						// Join all of the elements together, separated with commas, and wrap them in
						// brackets.

						v = partial.length === 0 ? '[]' :
                        gap ? '[\n' + gap +
                                partial.join(',\n' + gap) + '\n' +
                                    mind + ']' :
                              '[' + partial.join(',') + ']';
						gap = mind;
						return v;
					}

					// If the replacer is an array, use it to select the members to be stringified.

					if (rep && typeof rep === 'object') {
						length = rep.length;
						for (i = 0; i < length; i += 1) {
							k = rep[i];
							if (typeof k === 'string') {
								v = str(k, value, rep);
								if (v) {
									partial.push(quote(k) + (gap ? ': ' : ':') + v);
								}
							}
						}
					} else {

						// Otherwise, iterate through all of the keys in the object.

						for (k in value) {
							if (Object.hasOwnProperty.call(value, k)) {
								v = str(k, value, rep);
								if (v) {
									partial.push(quote(k) + (gap ? ': ' : ':') + v);
								}
							}
						}
					}

					// Join all of the member texts together, separated with commas,
					// and wrap them in braces.

					v = partial.length === 0 ? '{}' :
                    gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
                            mind + '}' : '{' + partial.join(',') + '}';
					gap = mind;
					return v;
			}
		}

		// Return the JSON object containing the stringify and parse methods.

		return {
			stringify: function(value, replacer, space) {

				// The stringify method takes a value and an optional replacer, and an optional
				// space parameter, and returns a JSON text. The replacer can be a function
				// that can replace values, or an array of strings that will select the keys.
				// A default replacer method can be provided. Use of the space parameter can
				// produce text that is more easily readable.

				var i;
				gap = '';
				indent = '';

				// If the space parameter is a number, make an indent string containing that
				// many spaces.

				if (typeof space === 'number') {
					for (i = 0; i < space; i += 1) {
						indent += ' ';
					}

					// If the space parameter is a string, it will be used as the indent string.

				} else if (typeof space === 'string') {
					indent = space;
				}

				// If there is a replacer, it must be a function or an array.
				// Otherwise, throw an error.

				rep = replacer;
				if (replacer && typeof replacer !== 'function' &&
                        (typeof replacer !== 'object' ||
                         typeof replacer.length !== 'number')) {
					throw new Error('JSON.stringify');
				}

				// Make a fake root object containing our value under the key of ''.
				// Return the result of stringifying the value.

				return str('', { '': value });
			},


			parse: function(text, reviver) {

				// The parse method takes a text and an optional reviver function, and returns
				// a JavaScript value if the text is a valid JSON text.

				var j;

				function walk(holder, key) {

					// The walk method is used to recursively walk the resulting structure so
					// that modifications can be made.

					var k, v, value = holder[key];
					if (value && typeof value === 'object') {
						for (k in value) {
							if (Object.hasOwnProperty.call(value, k)) {
								v = walk(value, k);
								if (v !== undefined) {
									value[k] = v;
								} else {
									delete value[k];
								}
							}
						}
					}
					return reviver.call(holder, key, value);
				}


				// Parsing happens in four stages. In the first stage, we replace certain
				// Unicode characters with escape sequences. JavaScript handles many characters
				// incorrectly, either silently deleting them, or treating them as line endings.

				cx.lastIndex = 0;
				if (cx.test(text)) {
					text = text.replace(cx, function(a) {
						return '\\u' + ('0000' +
                                (+(a.charCodeAt(0))).toString(16)).slice(-4);
					});
				}

				// In the second stage, we run the text against regular expressions that look
				// for non-JSON patterns. We are especially concerned with '()' and 'new'
				// because they can cause invocation, and '=' because it can cause mutation.
				// But just to be safe, we want to reject all unexpected forms.

				// We split the second stage into 4 regexp operations in order to work around
				// crippling inefficiencies in IE's and Safari's regexp engines. First we
				// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
				// replace all simple value tokens with ']' characters. Third, we delete all
				// open brackets that follow a colon or comma or that begin the text. Finally,
				// we look to see that the remaining characters are only whitespace or ']' or
				// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.

				if (/^[\],:{}\s]*$/.
					test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
					replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
					replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {

					// In the third stage we use the eval function to compile the text into a
					// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
					// in JavaScript: it can begin a block or an object literal. We wrap the text
					// in parens to eliminate the ambiguity.

					j = eval('(' + text + ')');

					// In the optional fourth stage, we recursively walk the new structure, passing
					// each name/value pair to a reviver function for possible transformation.

					return typeof reviver === 'function' ?
                        walk({ '': j }, '') : j;
				}

				// If the text is not JSON parseable, then a SyntaxError is thrown.

				throw new SyntaxError('JSON.parse');
			}
		};
	} ();
}