/* エスケープされた文字を戻す */
    var node = document.createTextNode(usr.text.
        replace(/&(lt|gt|quot|amp);/g,function(_$,_1){
          return {lt:'<', gt:'>', quot:'"', amp:'&'}[_1];
        })
    );
    /* テキストノードの挿入 */
    entry.appendChild(node);
    linkfy(entry, '@(\\w+)', '[^\\w@]|$',
        'http://twitter.com/');
    linkfy(entry, '#(\\w+)', '[^\\w#]|$',
        'http://search.twitter.com/search?q=%23');
    linkfy(entry, '(https?://.*)',
        '[ 　\\)\\]\'\"\n]|$', '');
    expandUrl(entry);
    highlight(entry, keyword);

function linkfy(element, start, end, prefix){
  for (var i =0,l = element.childNodes.length;i < l;i++){
    var node = element.childNodes[i];
    if(node.nodeType !== 3){
      continue;
    }
    if (node.nodeValue.search(start) >= 0) {
      var text = node.nodeValue, index;
      var parent = node.parentNode;
      while (text && (index=text.search(start)) >= 0 ){
        // テキストを分割し、後ろ側のノードを取得
        var _txt = node.splitText(index);
        // キーワードの終わりで再度分割
        var _end = _txt.nodeValue.search(end);
        var __txt = _txt.splitText(_end);
        var a = document.createElement('a');
        a.href = prefix + _txt.nodeValue.match(start)[1];
        a.target = '_blank';
        a.appendChild(_txt);
        if (!__txt.nodeValue || !__txt.parentNode){
          parent.appendChild(a);
        } else {
          parent.insertBefore(a, __txt);
        }
        // ループ用に初期化
        text = __txt.nodeValue;
        node = __txt;
      }
    }
  }
}

function expandUrl(element){
  var links = element.getElementsByTagName('a');
  for (var i =0,l = links.length;i < l;i++){
    var a = links[i];
    // 長いURLやtwitter.comの内部リンクは対象外
    if (a.href.length < 30 && a.host !== 'twitter.com'){
      getCrossSiteXhrOrJsonP(a);
    }
  }
}
function getCrossSiteXhrOrJsonP(a){
  // 現在のURLとAPIのURLが同一オリジンかチェック
  var same_origin = location.hostname === 'ss-o.net' &&
        (location.port==='' || location.port==='80') &&
        location.protocol === 'http:';
  var xhr;
  var onload =  function(){
    var data = JSON.parse(xhr.responseText);
    if (data.url && data.url !== a.href){
      a.textContent = data.url;
      a.href = data.url;
    }
  };
  if (same_origin) {
    xhr = new XMLHttpRequest();
  } else if(window.XDomainRequest){
    xhr = new XDomainRequest();
  } else if(window.XMLHttpRequest) {
    xhr = new XMLHttpRequest();
    if (!('withCredentials' in xhr)){
      xhr = {
        open:function(method, url){
          var s = document.createElement('script');
          xhr.__script = s;
          var callback = ('JSONP_' + new Date().getTime() +
              Math.random()).replace(/\W/,'');
          s.src = url + '&callback=' + callback;
          window[callback] = function(data){
            xhr.responseText = JSON.stringify(data);
            onload();
            document.body.removeChild(s);
            delete window[callback];
          };
        },
        send:function(){
          document.body.appendChild(xhr.__script);
        }
      };
    }
  }
  xhr.open('GET', 'http://ss-o.net/api/reurl.json?url=' +
      encodeURIComponent(a.href), true);
  if (!('onload' in xhr)){
    xhr.onreadystatechange = function(){
      if(xhr.readyState === 4 && xhr.status === 200){
        onload();
      }
    };
  } else {
    xhr.onload = onload;
  };
  xhr.send(null);
}

      xhr = {
        open:function(method, url){
          var s = document.createElement('script');
          xhr.__script = s;
          var callback = ('JSONP_' + new Date().getTime() +
              Math.random()).replace(/\W/,'');
          s.src = url + '&callback=' + callback;
          window[callback] = function(data){
            xhr.responseText = JSON.stringify(data);
            onload();
            document.body.removeChild(s);
            delete window[callback];
          };
        },
        send:function(){
          document.body.appendChild(xhr.__script);
        }
      };