subdomain redirect problem

[dimebag12]

hi
ive little problem
iam using url shortener script it works in subdomain mode for example
i give the url and give me the url like this xyx.myhost.com
but the problem is it does not redirect this shortened url ( in fact subdomain ) to the main address the shortened url returns to the main index.php of the script instead of going to the main address
i tought that there must be something wrong with htaccess for redirecting the url to the main address
ive wildcard dns active too
can some one verify it
this is htaccess setting

<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{HTTP_HOST} !www.domain.com$
RewriteCond %{HTTP_HOST} ^{(www.)?([a-z0-9-]+).domain.com$}
RewriteRule ^(.*)$ go.php?s=%2&file=$1 [L,QSA]
</IfModule>

thanks