google.load("feeds", "1");
function book_initialize() {

var feed = new google.feeds.Feed("http://www.amazon.co.jp/rss/bestsellers/books/492332/ref=pd_ts_rss_link?tag=bnets-22");

feed.setNumEntries(10);

feed.load(function(result) {
  if (!result.error) {
    var container = document.getElementById("feed_book");
    var html ='';

   for (var i = 0; i < result.feed.entries.length; i++) {
      var entry = result.feed.entries[i];
      html += entry.content+'<p>';
    }

  container.innerHTML= html;

  }
});

} 
google.setOnLoadCallback(book_initialize);