function update_size() {
    var contents_frame = document.getElementById("sidebar_content");
    if (contents_frame) {
      var doc = contents_frame.contentDocument;
      if (!doc)
        doc = contents_frame.Document;
      if (doc) {
        var doc_body = doc.body;
        if ( !doc_body )
          {
            var bodies = doc.getElementsByTagName( "body" );
            doc_body = bodies[ 0 ];
          }
        if (doc_body) {
          var new_height = 0;
          if ( typeof doc_body.scrollHeight != "undefined" )
            new_height = doc_body.scrollHeight;
          new_height += 8;
          if (new_height < 200) {
            new_height = 200;
          }
          contents_frame.height = new_height;
        }
      }
    }
  }