old_contents: $(document).ready(function() {
  
  	$('.schema-explanation').hide();
    
  	$('.get-started').click(function(e){
  		e.preventDefault();
  		$('.home-explanation').hide();
  		$('.schema-explanation').show();
  	})
  
  	$('.modal-trigger').leanModal();
  
  });
new_contents: $(document).ready(function() {
  
  	window.onbeforeunload = function() {
    	return "You are attempting to leave this page.";}
  
  	$('.schema-explanation').hide();
    
  	$('.get-started').click(function(e){
  		e.preventDefault();
  		$('.home-explanation').hide();
  		$('.schema-explanation').show();
  	})
  
  	$('.modal-trigger').leanModal();
  
  });
subject: Add popup when back button or refresh hit