how to create a small window coming out when scrolling down?

I need to create a small window that will come out when I scroll down some number of pixels.

An example can be seen here, but sometimes the window doesn't show, so I also give you a screen shot that captures the example.

You can see that a small window comes out from right side when you scroll down to the bottom. I need to do this exactly as the first link does (with the closing button and all).

This is what I've already written to create the window:

 var amountScrolled2 = 3000;

$(window).scroll(function() {
  if ( $(window).scrollTop() > amountScrolled2 ) {
    $('div.banner').fadeIn('slow');
  } else {
    $('div.banner').fadeOut('slow');
  }
});

div.banner {
  display: none;
  width: 300px;
  height: 400px;
  background-color:white;
  position: fixed;
  z-index: 999;
  right: 0px;
  bottom: 120px;
  text-align: center;
  padding: 0;
  border:1px solid #ddd;
  border-right:none;
  padding:20px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div class="banner hidden-xs">
        <h3 style="color:black;font-size:22px;"><span class="blink"><b>DID YOU READ THIS?</b></span></h3>
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        <p style="text-align:left;"><img src="images/professor1.jpg" class="img-circle" width="25" height="25"> John Wotson. Professor,<br>University of Moratuwa.</p>
      
    </div>

I also want to add a close button, and instead of fade in and fade out, I want the window to open/close from right side. How can I do that, based on what I already have working?