//<![CDATA[
$(function() {

    function filterPath(string) {
        return string
                        .replace(/^\//, '')
                        .replace(/(index|default).[a-zA-Z]{3,4}$/, '')
                        .replace(/\/$/, '');
    }

    var locationPath = filterPath(location.pathname);
    var scrollElem = scrollableElement('html', 'body');

    // Any links with hash tags in them (can't do ^= because of fully qualified URL potential)
    $('a[href*=#]').each(function() {

        // Ensure it's a same-page link
        var thisPath = filterPath(this.pathname) || locationPath;
        if (locationPath == thisPath && (location.hostname == this.hostname || !this.hostname) && this.hash.replace(/#/, '')) {

            // Ensure target exists
            var $target = $(this.hash), target = this.hash;
            if (target) {

                // Find location of target
                var targetOffset = $target.offset().top;
                $(this).click(function(event) {

                    // Prevent jump-down
                    event.preventDefault();

                    // Animate to target
                    $(scrollElem).animate({ scrollTop: targetOffset }, 400, function() {

                        // Set hash in URL after animation successful
                        location.hash = target;

                    });
                });
            }
        }

    });

    // Use the first element that is "scrollable"  (cross-browser fix?)
    function scrollableElement(els) {
        for (var i = 0, argLength = arguments.length; i < argLength; i++) {
            var el = arguments[i],
                                $scrollElement = $(el);
            if ($scrollElement.scrollTop() > 0) {
                return el;
            } else {
                $scrollElement.scrollTop(1);
                var isScrollable = $scrollElement.scrollTop() > 0;
                $scrollElement.scrollTop(0);
                if (isScrollable) {
                    return el;
                }
            }
        }
        return [];
    }

});
//]]>