Help PHP Script Help ????

Hey there, I have a script running and I got it from a member on here. Just checking make sure that they are not taking some of my traffic and revenue>
What else to look for and make sure they have not placed anything in to redirect. From reading up a EVAL function is typically used i guess???

I found this code here looked odd... Please tell me... What is this and is it any concern. How can I check to see if there are taking any leads. the script and my affiliate ID is working all good. Just making sure there is not some backdoor workings going on also....

<script type="text/javascript" src="profile_files/helpers.js"></script>
<script type="text/javascript">
// <![CDATA[
var sid = 'a835ecdc810d37f49f77b0f262187849';

Well, it's not PHP...

First line call a JAVASCRIPT file
Next lines, it's only some session ID.

This is not a php Code