Basic question: What to submit with banners

Sorry if this has been touched on already, I did a search but nothing came up.

My question seems simple, what should our media team be submitting with banner ads? At the moment they are sending (Flash CS3 AS1) swfs only, but some sites are reporting that they are not working (blank). I assume it’s because we are not sending the javascript file that is generated when published? Wouldn’t the site we advertise with then need to code script in their HTML to point to our script? Is that standard?

Thanks for your help,