Google today announced a new website translator gadget
powered by Google Translate that enables website owners to make their site's content available in 51 languages.
When people visit a page, if their language (as determined by their browser settings) is different than the language of their page, they'll be prompted to automatically translate the page into their own language. If the visitor's language is the same as the language of a page, no translation banner will appear.
The tool can be easily installed by adding a short snippet into a webpage.