if (!Array.prototype.slice) {
    Array.prototype.slice = function (i, i2) {
        var cake = [];
        for (; i < i2; i++)
            cake.push(this[i]);
        return cake;
    };
}

if (!String.prototype.slice) {
    String.prototype.slice = function (i, i2) {
        var cake = "";
        for (; i < i2; i++)
            cake += this.chatAt(i);
        return cake;
    };
}