title: Trigger events when the window is scrolled to certain positions
body: <p>I would like to call functions when the browser window goes beyond a certain point<br>
  (e.g the user scrolled the window down beyond 200px from the top</p>
  
  <p>Is there an event I can bind to and then how would I check how much the offset is from the top of the browser to the top of the page?</p>