how do i prevent the url from changing in the address bar?

[verbatim]

quick question:
how do i prevent the url from changing in the address bar?

currently, when i type timmy.bar.com - it goes to www.bar.com/okay/timmy
but the address bar will continue to show timmy.bar.com.

After clicking on a link though, it will show the full url.

how do i configure it so that the address bar always shows timmy.bar.com?

thanks

my current code
[code]

RewriteCond %{HTTP_HOST}!^(www\.)?(www¦mail¦images)\.domain\.com
RewriteCond %{HTTP_HOST} ^(www\.)?([^.]+)\.bar\.com
# ok rewrite now
RewriteRule ^(.*) http://www.bar.com/okay/%2/$1 [P,L]