SonicWall NSA2400 port 80 options

Hi, we have a Sonicwall NSA 2400 and I'm trying to see if it is possible to have multiple websites point to the SW's public IP and have the SW route that traffic to a single internal webserver where it will be routed to the correct site. Currently we are using a redirect at domain registrar and then rules on the SW to redirect that port's traffic to the internal webserver. So on the DR we have test.site.com set to the SW public address and then at the DR there is a port 80 redirect for any port number, lets say 8888. The SW receives that info and forwards 8888 traffic to port 80 on the internal webserver. This has been just fine for us up to this point, but now we have a site that uses maps for field folks to find things. It appears that once into the site via the redirect, the site tries to access other internal pages on that site with the 8888 port number vice the default 80 and things don't work. If we could find a way to send multiple websites e.g. test.site.com, test1.site.com etc to the same public IP using no redirect and have the SW relay the traffic to the internal webserver and there it would be routed to the proper site. I know this is possible with an IIS server with a public address by using host header entries in the bindings. I just chatted with SW tech on it and he said it couldn't be done, but I'm not so sure since an external IIS server can do it, I would think an appliance like the 2400 could. Thanks for your ideas.