title: Change class depending on window and page size.
body: <p>I have a DIV at the bottom of my page. </p>
  
  <p>Basically if the page height is smaller than the window I want it's class to be "firstclass".</p>
  
  <p>And if the page height is taller than the window I want it's class to be "secondclass".</p>
  
  <p>Can anyone help me out? Thanks :)</p>