amazon-gp.js

javascript:
(function(){
    var id = 'bouzuya-22';
    var pattern = /^http:\/\/www\.amazon\.co\.jp(?:.*)\/(?:(?:gp\/product)|(?:dp))\/([0-9A-Za-z]{10}).*$/;
    var result = location.href.match(pattern);
    if (result == null) {
        return;
    }
    var text = document.createTextNode('A!');
    var href = 'http://amazon.jp/o/ASIN/' + result[1] + '/' + id;
    var anchor = document.createElement('a');
    anchor.appendChild(text);
    anchor.setAttribute('href', href);
    document.getElementById('btAsinTitle').appendChild(anchor);
    return false;
})();