Track Linked In shares in Javascript

gistfile1.html

<!-- Importing Linked In Library -->
<script src="//platform.linkedin.com/in.js" type="text/javascript">
 lang: en_US
</script>

<!-- Add Javascript Callback function -->
<script>
function callback(){
 alert("ok"); // Change to real code
}
</script>

<!-- Insert LinkedIn share button with callback attribute -->
<script type="IN/Share" data-counter="top" data-onsuccess="callback" ></script>