title: jQuery DatePicker: display an error when input not in proper format
body: <p>I've got a DatePicker that automatically inserts the date in <code>Mon-dd-yyyy</code> format and, like so many others, it breaks if an improper format (e.g.  <code>monddyyyy</code>, <code>yyyy-dd-mm</code>, etc.) is used to enter the date when not in read-only mode.</p>
  
  <p>I want to take DatePicker and have it check to see if the date fits the <code>Mon-dd-yyyy</code> format and just spit an error held in a hidden <code>div</code> (there's already one for the date being blank) as opposed to going to a stack trace page.</p>