Hi doe's anyone know where I can get a free image/banner rotation script?

I want one similar to what http://www.ebuyer.com/ are currently using, it rotates between 4 images but user can also switch between them using small buttons at the bottom. I want the images/banner to also link to another page.

That is jquery effect. you can get many similar to that script. see this http://ajaxcase.com/ or http://www.dynamicdrive.com/

Not sure if it's what you're looking for, but http://www.malsup.com/jquery/cycle/ is pretty good for rotating pics.

Try phpadsnew ( http://sourceforge.net/projects/phpadsnew/ ), it's really powerful ads management system. However, you may need to read some tutorials in order to get the most of this system.