var wp       = google.gears.workerPool;
wp.allowCrossOrigin();
wp.onmessage = function(a, b, message) {  
  var origin = new String(message.origin);
  var parts  = origin.split("/");
  var domain = parts[2];
  parts      = domain.split(":"); // remove port
  domain     = parts[0];
 
  var recipient = domain;
  var channelId = message.text;
 
 
  var db = google.gears.factory.create('beta.database');
  db.open('database-xssinterface');
  db.execute('create table if not exists XSSMessageQueue' +
     ' (id INTEGER PRIMARY KEY AUTOINCREMENT, recipient_domain TEXT, channel_id TEXT, message TEXT, insert_time INTEGER)');
 
  // delete (and thus ignore) old messages
  var maxAge = new Date().getTime() - 2000;
  db.execute('delete from XSSMessageQueue where insert_time < ?',[maxAge]);
 
  // find new messages for me
  var rs = db.execute('select id, message from XSSMessageQueue where recipient_domain = ? and channel_id = ?', [recipient, channelId]);
 
  // there is a new message for the recipient
  if (rs.isValidRow()) {
          var id   = rs.field(0);
          var text = rs.field(1);
          db.execute("DELETE from XSSMessageQueue where id=?", [id]); // unqueue message
          wp.sendMessage(text, message.sender)
  }
 
  rs.close();
}