Another .htaccess question - masking URL

[LLLLLLL]

This section of the site is filled with .htaccess stuff, huh?

 

Anyway, this is what I have:

 

somesite.com/store/*  (all files are in the "store" folder)

 

And this is what I want:

1) somesite.com/blah.php to be a URL, but the server will actually show somesite.com/store/blah.php

2) A visitor who tries to go to somesite.com/store/blah.php should be inaccessable directly, or it should redirect to the URL in #1 while actually showing this URL. (Hopefully you understand.)

 

I've done .htaccess work before, but I guess I've never tried to strip out text in the middle of a URL.