IIS Configuration

You do this by setting up "host headers" to identify each of the virtual domains that the IIS machine in question will serve - in the Internet Services Manager, first add a web site for each that you want to serve, then right click the site name, select Properties, Advanced..., Add..., and then specify in the host header name field the URL root that you want to associate with this site. Do this for however many sites you want to serve on this IIS server.
In your case, the host headers would be http://www.domainname.com & help.domainname.com.

Voila

Thanks that works but I have one slight problem. The main web's homepage takes priority over the new host header's if I type in help.domain.com, but if I type help.domain.com/index.htm it works perfectly. Any ideas on how to fix this?

(Thanks so much for your help so far).

-Dan

Your host headers would be:

www.domainname.com
help.domainname.com

On my last post, I forgot to uncheck "Automatically parse URLs", so the message board automagically added http:// to the front of the www one, which isn't what I intended - try it that way, and let me know if that doesn't fix it, and I'll scratch my head some more.

Stop the presses, thought of one more thing, which is that by default, IIS looks for default.asp & default.htm as the default web page is you just type in the virtual directory name (not index.htm). I'd suggest renaming your index.htm files to default.htm; alternatively, you can go to the Documents tab of the Properties dialog, and add index.htm as a default document to look for.

Thank you so much for your help. By switching the default index page to Default.htm it worked like a charm.

Thanks again for you help.

-Dan

Glad I could help