[Can't track clicks in html banners]

Hello,

We are having trouble tracking clicks from html banners. We receive data only for impressions. Here is a sample banner files and the code used in the server:

 

https://drive.google.com/folderview?id=0Bx2ZfuadXUzcN05YN0t0RnZtNnM&usp=sharing

 

<iframe 
 style="border:none; margin:0; padding:0; overflow:hidden;" 
    width="960" 
    height="200"
    scrolling="no" 
    frameborder="0" src="http://ox.adffiliate.bg/extern/gala-201608/dama.bg/gala-banner-960-200.html">
    </iframe>