Steve,
Did you build the site yourself or pay a designer?
If you paid for it I personally would ask for it not to be built using iframe, really bad for Seo.
Go to home page, right click and then view source.... there is none other than the little iframe code.
The search engine bots have nothing read when searching your site so getting a high position on Google could be a problem for you depending on your competitions sites.
Good luck anyway!
Matt