disqus lazy load

disqus.js

<script type="text/javascript">
var comments = document.getElementsByClassName('comments')[0],
    disqusLoaded=false;

function loadDisqus() {
    var disqus_shortname = 'netrival';
    var dsq = document.createElement('script');
    dsq.type = 'text/javascript';
    dsq.async = true;
    dsq.src = 'http://' + disqus_shortname + '.disqus.com/embed.js';
    (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
    disqusLoaded = true;
}
//Get the offset of an object
function findTop(obj) {
    var curtop = 0;
    if (obj.offsetParent) {
        do {
            curtop += obj.offsetTop;
        } while (obj = obj.offsetParent);
        return curtop;
    }
}

if(window.location.hash.indexOf('#comments') > 0)
    loadDisqus();

if(comments) {
    var commentsOffset = findTop(comments);

    window.onscroll = function() {
        if(!disqusLoaded && window.pageYOffset > commentsOffset - 1500) {
            console.log('load comments, NOW!!');
            loadDisqus();
        }
    }
}

</script>

functions.php

/*** Disqus Comment for Genesis Framework ***/
remove_action( 'genesis_comments', 'genesis_do_comments' );
add_action('genesis_comments', 'wpa_disqus_comments' );
function wpa_disqus_comments() {
if ( is_single() ) { 
?>
<aside id="comments" class="entry-comments comments">
  <h3>Comments</h3>
	<div id="disqus_thread"></div>
	<script type="text/javascript">
        var disqus_url = "<?php the_permalink(); ?>";
        var disqus_identifier = "<?php the_ID(); ?> <?php echo home_url('/'); ?>?p=<?php the_ID(); ?>";
	</script>
	<noscript><a href="http://disqus.com/?ref_noscript">Please wait, Comments are being loaded</a></noscript>
	<a href="http://disqus.com" class="dsq-brlink">Please wait, Comments is being loaded</a>
	</aside>
<?php }
}