UBB.Developers Forums UBB.threads 7 Development How Do I? URL masking

I have a little question to ask..
Say I have an Internet DNS name i.e. www.mydomain.com and it is forwarded to mydomain.redirect.com. I don't have a static ip and have to use a free DNS service and agent to update the DNS mydomain.redirect.com if the IP changes..

So what I want is, for http://www.addicted2travel.com to still appear in the URL address bar after it has redirected to http://addicted2travel.dynalias.com

I am wanting to run a PHP forum similar to this and it would look more professional if the non redirected url was displayed at all times.... is this possible and if so how??

My DNS host let me use URL masking.. However when I put use http://www.addicted2travel.com everything appears to work, except when I log in.. it says not all the fields were filled in.. is it possible in PHP/UBBT to use both DNS addresses???

Many thanks and I hope I have explained this properly.