// 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 (userService == null) var userService = {};
userService._path = '/dwr';
userService.existingLogin = function(p0, callback) {
  dwr.engine._execute(userService._path, 'userService', 'existingLogin', p0, callback);
}