jQuery(function($) {
    $.fn.reverse = function() {
        return this.pushStack(this.get().reverse(), arguments);
    };

    $.each(['prev', 'next'], function(unusedIndex, name) {
        $.fn[name + 'ALL'] = function(matchExpr) {
            var $all = $('body').find('*').andSelf();
            $all = (name == 'prev') ? $all.slice(0, $all.index(this)).reverse() : $all.slice($all.index(this) + 1);
            if (matchExpr) $all = $all.filter(matchExpr); return $all;
        };
    });
});