root/lang/javascript/userscripts/associatethis.user.js

// ==UserScript==
// @name        Associate This
// @namespace   http://carbonfairy.org/ns/userscripts
// @include     http://www.amazon.co.jp/*
// @include     http://amazon.co.jp/*
// @version     0.4.1
// @license     MIT License
// ==/UserScript==

new function() {
        var w = typeof unsafeWindow != 'undefined' ? unsafeWindow : window;
        var $ = w.jQuery;

        if (!w.asin || !$) return;
        var container = $('.buyingDetailsGrid');
        if (!container.length) return;

        $('<tr><td id="associate-this"><button>Associate This</button></td></tr>')
                .appendTo(container)
                .find('td').css('text-align', 'center')
                        .find('button')
                                .click(function() {
                                        var uri = 'http://pipes.yahoo.com/pipes/pipe.run';
                                        var q = {
                                                AWSAccessKeyId: '17WV92D5WX2R1VET0H02',
                                                AssociateTag  : 'clothfairy-22',
                                                ItemId        : w.asin,
                                                _id           : 'DM6ru9_R3BGmxGU9xAnzeQ',
                                                _render       : 'json'
                                        };

                                        $.getJSON(uri+'?_callback=?', q, function(data) {
                                                var item = data.value.items[0].Items.Item;
                                                var code = [
                                                        '<ul class="drop">\n',
                                                        '<li><a href="http://www.amazon.co.jp/o/ASIN/'+item.ASIN+'/'+q.AssociateTag+'/ref=nosim">#{content}</a></li>\n',
                                                        '</ul>'
                                                ].join('');
                                                var title = escapeTag(item.ItemAttributes.Title);
                                                code = code.replace(
                                                        '#{content}',
                                                        item.SmallImage ?
                                                                '<img src="'+item.SmallImage.URL+'" alt="'+title+'" width="'+item.SmallImage.Width.content+'" height="'+item.SmallImage.Height.content+'"/>' :
                                                                title
                                                );

                                                $('<textarea/>')
                                                        .replaceAll('#associate-this')
                                                        .css({
                                                                width : '90%',
                                                                height: '100px',
                                                                margin: '3px 5%'
                                                        })
                                                        .text(code);
                                        });

                                        return false;
                                });

        function escapeTag(str) {
                return str
                        .replace(/&/g, '&amp;')
                        .replace(/"/g, '&quot;')
                        .replace(/</g, '&lt;')
                        .replace(/>/g, '&gt;');
        }
};