Convert Frontpage to Dreamweaver

My website is [login to view URL], this is an ecommerce site. I started it a few years ago and kept adding to it without understanding basic fundamentals of web design.? I have hired someone who will be doing some specialized work for me, but he uses Dreamweaver CS3. I have purchased CS3, and am learning to use it, but I am unable to use the site in Dreamweaver because Microsoft has set up FrontPage to protect itself from other design software. I need to convert the site to be compatable with Dreamweaver (no CSS programming or anything else, just converted to enable Dreamweaver CS3 to make page modifications). What I would like to do is upload the site to another domain for the conversion to be worked on and tested, then once I am certain the conversion will work without the site being down for very long, I will allow the live conversion to Dreamweaver.