function login()
{
  var http_request;
  if (window.XMLHttpRequest)
  { // Mozilla, Safari, ...
    http_request = new XMLHttpRequest();
  }
  else if (window.ActiveXObject)
  { // IE
    http_request = new ActiveXObject("Microsoft.XMLHTTP");
  }
  //http_request.onreadystatechange = flipUserInfoBox;
  //TODO check response
  http_request.open('post', '/module/log/in?loginName=enka&password=enka', true);
  http_request.send(null);
}