function loopInvitationList()
{
  httpInvitationList.handle('ajax/invitations.php');
  setTimeout("loopInvitationList();", 4000);  
}


function loadInvitationList(tag)
{
  httpInvitationList = new HttpRequest();
  httpInvitationList.tag      = tag;
  httpInvitationList.response = httpInvitationList.writeHTML;
  loopInvitationList();
}