Is there an easy way of making this so that if someone keys in www.sub1.domain.com that the subdomain will work by displaying a file at,say, www.domain.com/sub1
simlarly,
www.sub2.domain.com would 'secretly' map to www.domain.com/sub2.html
www.sub3.domain.com would go to www.domain.com/sub3.html
etc
etc
Thank you.