Ok, here's the problem... I'm taking over from an old webmaster that's not co-operative.
We control the domain name, but not the old server.
I can redirect the old pages to the new pages (by using the site: command to pull up a list of all pages in Google), but as I can't do this for the images stored by Google, and as I cant get on the server I can't move the images directly... There are lots of images that need to be moved from one server to the other, either that or deleted from Google's index.
Any help appreciated. I'm worried when the new website is launched all the missing old images will result in the website getting hammered on the rankings.