Yes.
Create your pages, usually for a 500 and 404 error to cope with a lot of the errors, but you can make as many as you like. Then speak to your webhost/server adminstrator/yourself about pointing the website errors to these new pages. This is done easily from the properties of the site in IIS manager.
That's all you need to do. Derren
[Mediocre talent - spread really thin]