if (!Array.prototype.map) {
Array.prototype.map = function(fun /*, thisp*/) {
var len = this.length >>> 0; // make sure length is a positive number
if (typeof fun != "function") // make sure the first argument is a function
throw new TypeError();
var res = new Array(len); // initialize the resulting array
var thisp = arguments[1]; // an optional 'context' argument
for (var i = 0; i < len; i++) {
if (i in this)
res[i] = fun.call(thisp, this[i], i, this); // fill the resulting array
}
return res;
};
}