google.load("feeds", "1");

function init_desc() {
  var feedurl = "http://rssblog.ameba.jp/lapi2020/rss20.xml";
  var feed = new google.feeds.Feed(feedurl);
  feed.setNumEntries(1);
  feed.load(disp_desc);

  function disp_desc(result){
    if (!result.error){
		var container = document.getElementById("main_desc");
		var htmlstr = "";

		var entry = result.feed;
		htmlstr += entry.description;

		container.innerHTML = htmlstr;
    }else{
		alert(result.error.code + ":" + result.error.message);
    }
  }
}

google.setOnLoadCallback(init_desc);