I'd start with tutorials about laying out the site 800-1000 wide X 600 eliminates most scrolling, but you will have to reposition your images. Sorry, I can't answer your question about viewing the different sizes. The above works, or you can do what you want and know some people will not see it without scrolling all over. Good luck. Your artwork is layed out nicely, but I'd move the light box up and the page and put the price buttons lower. Also make the prices a smaller size font, it might look classier.

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All the best
Catherine
www.catherinebuchanan.com