You cannot hide anything from the address bad using .htaccess, or anything else. This is the client-side element, nothing in a Web application can get any access to the browser.
However, you can use, in particular, such thing as
URL rewriting, which is totally different thing, but it can help you:
http://en.wikipedia.org/wiki/URL_rewriting[
^].
If this is something you may want, consider this nice tool helping you to write appropriate .htaccess:
http://www.iwebtool.com/htaccess_url_rewrite[
^].
—SA