How to track impressions on Banner ads?

Hi all,

Im running a Banner ad on a third party website.

It is just a picture with a link to the offer im promoting.

The problem i have is: no impressions are tracked, what is the easiest way to also track impressions for the Banner ad?

Hope someone can help me with this problem!

ps. the offer i promote also have the option to generate iframe code what will display a banner they made, when i use this impressions are tracked, but i would like to use my custom banners.