Script "pass through url parameters" for all landing pages

Hi all,
I need to pass the same url parameter through all links we have on all our landing pages exept a form. All links should get this kind of parameter: https://www.my-site.com/?marketing_channel=1&marketing_media=22&marketing_campagne=333
Did anyone do it alredy and could help me with a scrip?

Thanks a lot
Karina