so34243532

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0-alpha1/jquery.min.js"></script>
<div id="ok">
OK
</div>

CSS

#cc-m-12786466225{
  position: fixed;
  top: 0;
  left: 0;
  background: red;
}

JavaScript

var scrollPos;
$(window).scroll(function() {
    scrollPos = document.body.scrollTop;

    if (scrollPos < 10) {
            $('#cc-m-12786466225').fadeTo(100,1);
    } else {
            $('#cc-m-12786466225').fadeTo(100,0);
    }
});