If you are using Google Chrome, you may not require this bookmarklet but if you are using any other browser his will really help you. If you ever come across a web page written in a foreign language, Chrome will instantly translate the whole page into your native language without requiring any add-ons or toolbar.
One downside of Google Translation bookmarklets is that they always open the translated page in a new browser window (or tab). If you would like the translation to happen in line – just like Google Chrome - check this new bookmarklet that uses Microsoft Translator instead of Google Translate.
When you click the translation bookmarklet, it will automatically detect the language of the current page and will translate to your preferred language. Translation happens inline – so you don’t leave the page - and if you ever want to go back to the original version, just reload that page.
This is a great feature for your Firefox browser.
Here is a homepage link http://labs.microsofttranslator.com/bookmarklet/