hatena-bookmark-lower-thumbnail.user.js

// ==UserScript==
// @name        hatena-bookmark-lower-thumbnail
// @namespace   orednu.org
// @include     http://b.hatena.ne.jp/*
// @version     1
// ==/UserScript==

(function(w, d) {
    w.addEventListener('load', function () {
        var getElementsByTagAndClassName = function(element, tag, klass) {
            var elements = element.getElementsByTagName(tag);
            return Array.prototype.slice.call(elements).reduce(function(r, e) {
                var klasses = e.className||'';
                if (klasses.split(/ +/).indexOf(klass) >= 0) r.push(e);
                return r;
            }, []);
        };
        var getThumbnail = function(div) {
            return getElementsByTagAndClassName(div, 'a', 'thumbnail')[0];
        };
        var getQuote = function(div) {
            return div.getElementsByTagName('blockquote')[0];
        };
        var swapTitleAndThumbnail = function(div) {
            var thumb = getThumbnail(div);
            var ul = div.parentNode.parentNode;
            if (thumb && /^entry-vertical/.test(ul.className||'')) {
                div.removeChild(thumb);
                div.appendChild(thumb);
            }
        };

        var divs = getElementsByTagAndClassName(d, 'div', 'entry-contents');
        divs.forEach(swapTitleAndThumbnail);
    });
})(window, document);