The www. in www.mydomainpage.com is already a subdomain it seems to me that what you should be doing is sub1.mydomainpage.com and sub2.mydomainpage.com What you are doing is just sticking things in directories? If you first setup the subdomains properly you can point them wherever you'd like. I hope that helps?
...turns out that my two cents is worth less or more depending on the current exchange rate.
roy darling *my posts seem a lot shorter in my head