// Provide a default path to dwr.engine
if (dwr == null) var dwr = {};
if (dwr.engine == null) dwr.engine = {};
if (DWREngine == null) var DWREngine = dwr.engine;

if (General == null) var General = {};
General._path = '/dwr';
General.keepalive = function(callback) {
  dwr.engine._execute(General._path, 'General', 'keepalive', callback);
}