Get Twitter followers count

Get Twitter followers count

I used Twitter Followers as:
<a href="https://twitter.com/tamilcselvan" class="twitter-follow-button"
data-dnt="true">Follow @tamilcselvan</a>
<script>!function(d,s,id){var
js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>
I want the twitter count from this twitter frame.
so i used a code as
twttr.ready(function (twttr) {
var a = window.frames[0];
a.document.getElementById('count').innerHTML;
});