or a popup or frame/table setting to keep the size of the site a set width and/or height.
most people consider popups as anoying and popups are usually blocked by popup blockers so a frame/table setting is proberbly best (if you dont want to go for the 100% width/height option)
make sure to get the right size, depending on what country you are in and what your target audience is your standard resolution is proberbly either 1024x768 or 800x600. you want to make sure your site fits within the standard resolution.
1024x768 -> max about 1000x550
800x600 -> max about 775x400
you sould test your site on as much resolutions/ systems/ monitors as possible befor going public.
good luck!
I learned a bit yesterday, today i learned a lot, imagine what i'll learn tomorrow!