bind()

bind.jquery.js

// Have jQuery?

if ( !Function.prototype.bind ) {
    Function.prototype.bind = function ( obj ) {
        args = [].slice.call( arguments );
        args.unshift( this );
        return $.proxy.apply( this, args );
    };
}

bind.js

if (!Function.prototype.bind) {
    Function.prototype.bind = function (obj) {
        // closest thing possible to the ECMAScript 5 internal IsCallable function
        if (typeof this !== 'function') {
            throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
        }
        var slice = [].slice,
            args = slice.call(arguments, 1),
            self = this,
            nop = function () { },
            bound = function () {
                return self.apply(this instanceof nop ? this : (obj || {}),
                                  args.concat(slice.call(arguments)));
            };
        bound.prototype = this.prototype;
        return bound;
    };
}