mod rewrite

Niche job board needs mod rewrite for better SEO. We need someone to help us convert dynamic urls as follows: [login to view URL];post_id=2289 to [login to view URL] In addition, on a separate subdomain we would like to convert the following dynamic urls as follows: [login to view URL] to [login to view URL] Since our main site has already been indexed by the search engines, we need to make sure we have a 301 redirect from old dynamic urls to new static urls to avoid duplicate content and so spiders can easily pick up the 301 and pass the scores and index the new urls. In addition, in case a person clicks on one of the old dynamic urls, we want to make sure it forwards to the new static url to avoid a 404 error.