title: JQuery Datepicker - only select mondays and thursdays
body: <p>I have the following code which only allows users to select Mondays from jquery datepicker.</p>
  
  <p>I want to adapt this to be able to select mondays and thursdays.</p>
  
  <p>Any ideas?</p>
  
  <pre><code>beforeShowDay: function(date){ return [date.getDay() == 1,""]}
  </code></pre>