Make hash anchors scroll smoothly

hookshot.js

/**
 * Hookshot v1.1
 * jQuery plugin for fragment anchors to scroll smoothly
 * by Arthur Corenzan <arthur@corenzan.com>
 * Creative Commons-Attribution-Share Alike
 * http://creativecommons.org/licenses/by-sa/3.0
 *
 * Usage:
 *
 * Target the anchors you want to enable smoothly
 * scrolling and apply hookshot on them
 *
 * <a href="#content">Skip to content</p>
 *
 * $("a[href=^a]").hookshot({});
 *
 * Options:
 *
 * speed: integer, milliseconds the animation takes
 */
 (function($) {
    $.fn.hookshot = function(o) {

        o = $.extend({
            speed: 200
        }, o);

        return this.each(function(i, that) {
            $(that).click(function(e) {
                e.preventDefault();

                var n, target;

                target = this.href.split('#').pop();
                n = target ? $('#' + target).offset().top : 0;
                $('html, body').animate({'scrollTop': n}, o.speed);
            });
        });
    };
})(jQuery);