title: Select start and end date in same calendar [JQuery]
body: <p>I am making a bookingsystem, and want to have one big calendar (table), with some information in a little box to the right.</p>
  
  <p>In the box I want to textfields:</p>
  
  <ul>
  <li>Checkin date</li>
  <li>Checkout date</li>
  </ul>
  
  <p>How can I, preferably with JQuery, do it so when the user pushes one date in the big calendar, the value of that date is transfered to the "Checkin date-field" in the litte sidebox, and at the same time, disables any previous dates for the next selection. The next time the user pushes a date, the "Checkout date" gets that value.</p>