title: jquery validation - how to set a general error message
body: <p>The documentation for jquery.validation here: <a href="http://jqueryvalidation.org/reference/" rel="nofollow">http://jqueryvalidation.org/reference/</a> states that it is possible to set a general message (q.v. General messages) for which you can set the container via the errorContainer option.</p>
  
  <p>However... it doesn't tell one how to actually set, nor trigger, that general error message. How does one do that? </p>