Round Robin Website?

How can I set up a round robin website? I want one name (mywebsite.com) to round robin to mutltiple windows servers that are hosting the same site. BUT these servers are also hosting other sites so they aren’t reachable via IP address. For example http://servernameA/siteB/Page http://servernameB/siteB/Page http://servernameC/siteB/Page All connecting to mywebsite.com.

Any ideas?
O and running IIS 5