JavaScript Modification for Click Tracking

I'm looking for someone that can modify the attached JavaScript below so that it will work without the need of an extra HTML "id" tag.

Script now works with the HTML code:
...
<div id="custom-ad-unit-1" class="custom-ad-unit"></div>
<div id="custom-ad-unit-2" class="custom-ad-unit"></div>
...
And the JavaScript should be modified to work with the HTML code:
...
<div class="custom-ad-unit-1"></div>
<div class="custom-ad-unit-2"></div>
...

=> Check the attached JavaScript file before bidding and solve the captcha (7+7) in you bid description.
* Access to a Test Site and FTP will be provided for testing the full script.