Redirect url without change at browsers end.

[rkrstar]

Can any one help me for: what apache configuration should I make to:
Redirect a url with out changing the original url being displayed at the browser's end.
In simple words, I want to redirect http://www.example.com/public/xyz to http://www.example.com/internal?param=xyz
where xyz may vary. (Please note:public/xyz has to be internal?param= xyz )
At the browser end, user should always see the typed url only ie, http://www.example.com/public/xyz

I tried RewriteRule, but at browsers end also the url was changed.
Regards, RKR.

[Markus]

Please see this thread and post back with any questions and what you have tried.