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Dmoz English-Spanish translators [dmoz.org].
</groan>
Have you tried Cats cradle? It's a prog that simplifies the task of translating...I think you can find it at slacker's guide.
So far as Machine Translation goes, I'd agree that finding a good translator is your best bet. Try looking up freelancers. Should run about 50 USD per full page of text, plus or minus.
Try creating a second page with all the script text showing as plain exposied text. Submit that page and then copy and paste the translated text into the original page. Someplace on the original page, add a button that allows the user to select the language they want and then display the correct script text.
--hm