Changing Address Link

I was wondering if its possible to change an address that uses querystrings to a file like system... for example:

   http://www.wolfweb.co.uk/?page=blog&id=2&comments=true
    becomes
   http://www.wolfweb.co.uk/blog/2/comments/

Is this easy enough to do. I don't want to actully have folders, just seem like it. My site is stored in one file (well, the XHTML and main contents any way), so it uses if statements to change from page to page. But this makes the nav look ugly, hence why I want an easy way to do it in a folder like view.

Muchos thankos!