function array_reverse (array, preserve_keys) {

// http://kevin.vanzonneveld.net

// + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

// + improved by: Karol Kowalski

// * example 1: array_reverse( [ 'php', '4.0', ['green', 'red'] ], true);

// * returns 1: { 2: ['green', 'red'], 1: 4, 0: 'php'}

var isArray = Object.prototype.toString.call(array) === "[object Array]",

tmp_arr = preserve_keys ? {} : [],

key;

if (isArray && !preserve_keys) {

return array.slice(0).reverse();

}

if (preserve_keys) {

var keys = [];

for (key in array) {

// if (array.hasOwnProperty(key)) {

keys.push(key);

// }

}

var i = keys.length;

while (i--) {

key = keys[i];

// FIXME: don't rely on browsers keeping keys in insertion order

// it's implementation specific

// eg. the result will differ from expected in Google Chrome

tmp_arr[key] = array[key];

}

} else {

for (key in array) {

// if (array.hasOwnProperty(key)) {

tmp_arr.unshift(array[key]);

// }

}

}

return tmp_arr;

}