Variable Logos

I am using the Emmet Pro theme and Affiliates Pro plugin.

I know very little about PHP but I was able to successfully replace the theme’s header logo with a variable logo based on the referrer_id. Ex: ../affiliate_logo2.png, or ../affiliate_logo3.png, etc…

Basically, each affiliate link will show the affiliates logo in the header of the theme on ever page. When the website is visited without an affiliate link the main logo will appear: affiliate_logo.png

The problem now is that if you visit an affiliate link (https://myrealadvantage.com/?affilaites=2) and then switch back to the non affiliate main URL (https://myrealadvantage.com/) the last affiliate visited appears as the main logo. For 95% of the world, this should not matter because they won’t be visiting both the affiliate link and the main URL but just in case, I’d like the affiliate_logo.png to appear as the default, no affiliate logo.

Thank you for your assistance with this.

Here is the revised header.php code.

[edited]