Just three things, that might help you:
- Javascript is not so popular nowadays as you would imagine. So you might simply put the word translation inside a title attribute (See HTML spec) before loading the page (serverside).
- You could determine the users language by having an IP-Country table-map related with their prefered language (from those that you provide). If the users native language is the same as the original text, then you could save the time of translating the page (it should also, save a lot of memory).
- You shouldn't face it as a translation resource (that is much more complex), but as a help guide, for people whose mother tongue is different than that of the page.
You should always provide an option for having the page displayed without any translation before accessing the mentioned page (and keep the option in a cookie).
Here is a link for further info-ideas:
http://www.cpanforum.com/dist/IP-Country
