// ①（head内に記述）

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">google.load("feeds", "1");
function initialize() {
   
  var feed = new google.feeds.Feed("http://pinterest.com/aintai/my-dining/rss");
  feed.load(function(rss) {
      if (!rss.error) {
           
          var channel = new Array();
          var entry = new Array();
           
          channel['title'] = rss.feed.title;
          channel['link'] = rss.feed.link;
          channel['favicon'] = "http://favicon.hatena.ne.jp/?url=" + channel['link'];
          channel['description'] = rss.feed.description;
          channel['author'] = rss.feed.author;
           
          for (var i=0; i<rss.feed.entries.length; i++){

              entry[i] = {
                  title : rss.feed.entries[i].title,
                  link : rss.feed.entries[i].link,
                  content : rss.feed.entries[i].content,
              };<
              entry[i]['img'] = rss.feed.entries[i].content.match(/src=\"(.*?)\"/igm);

               for (var j=0; j<entry[i]['img'].length; j++){
                   entry[i]['img'][j] = entry[i]['img'][j].replace(/src=/ig, "");
                   entry[i]['img'][j] = entry[i]['img'][j].replace(/\"/ig, "");
               }
          }
           
          var Feed = '<img class="fav" src="' + channel['favicon'] + '">\n'
                      + '<a href="' + channel['link'] + '">' + channel['title'] + '： </a>\n'
                      + '<a href="'+ entry[0]['link'] + '">' + entry[0]['title'] + '    ...</a>\n'
                      + '<img width="200" src="' + entry[0]['img'][0] + '">'
                      + '<img class="fav" src="' + channel['favicon'] + '">\n'
                      + '<a href="' + channel['link'] + '">' + channel['title'] + '： </a>\n'
                      + '<a href="'+ entry[1]['link'] + '">' + entry[1]['title'] + '    ...</a>\n'
                      + '<img width="200" src="' + entry[1]['img'][0] + '">'

                      + '<img class="fav" src="' + channel['favicon'] + '">\n'

                      + '<a href="' + channel['link'] + '">' + channel['title'] + '： </a>n'
                      + '<a href="'+ entry[2]['link'] + '">' + entry[2]['title'] + '    ...</a>\n'
                      + '<img width="200" src="' + entry[2]['img'][0] + '">'
          $('#topics').append( Feed );

      }
  });
}
google.setOnLoadCallback(initialize);</script>


//② body内に記述

<div id="topics"></div>