I am looking for a way to change the default name to the sharepoint home page (SBS 2003 with sharepoint 2.0)

I change the virtual name in the IIS and add a CNAME in the dNS, but that will only make it go to the "welcome to SBS server" page, and i want it to point to "companyweb/default.aspx"

Hope i made myself clear enaugh !