Gifs are good to use when you have an image with FEW colors. Jpgs is best to use for photos. Every good page is always under construction. Animations Don't have too many animated images at one page. It is very annoying to try to read the text at a page where everything is moving.
Linked images looks much nicer without a border.
Copyright at the Internet Do NOT take images from other sites without asking for permission. Almost everything at the internet ARE copyrighted - even if it doesn't say so at the page. Please think about that. The copyright rules are the same at the Internet as everywhere else. Learn more about this at my page about copyright .