Magento Redirect Page

Version: Magento 1.3.2.4 I need a redirect Page that redirects the browser to the specific product page. For example: You only know the 'sku' of the product, you should be able to open the product page by opening this URL: [login to view URL] The script in [login to view URL] should now lookup the URL for the specific product using the magento functions/methods and redirect to it (for example [login to view URL]) It should be as much compatible as possible without touching any core files. The redirect method should be search engine friendly to tell the search engine that the correct URL is [login to view URL] (i think "moved permanently" is the right way?) The key benefit of this script should be to be able to open any product by just knowing its 'sku' and be able to tell any spider/search engine to look at the correct place! Programming has to be done in your magento enviroment, I do only need the script.