passing authorization code

hi, .htaccess file requires user and pass. anybody know how to pass this info with a script so that the user is allowed into the directory? not in the url either. not user:pass@domain.com. needs to be transparent. the reason i want to do this is so that somebody can't path directly to a .mov file, but so they can click on a link and a script can "fetch" the file from the protected directory by passing the user and pass. the file needs to be embedded in the web page..... thanks.