Redirect from non-www to www url

[heinscott]

Hello.
I'm trying to get my home page to resolve to http://www.poolgeek.com/ when a user tries to type in http://poolgeek.com.
Right now, it is redirecting to http://www.poolgeek.com/default.aspx.
It is directing to the correct page, but my boss is worried that for SEO sake, the home page rank is being dilluted because of this.
Would anyone know how I could get this to resolve to just the http://www.poolgeek.com without the default.aspx stuck on the end?
Thanks for the help!

Scott

[heinscott]

Did anyone have any ideas about this? I tried to fix in the NavigationHelper.cs, but, replacing references to /Default.aspx with just the root didn't seem to correct.
??????????

Scott