Adding protected member area

Hello there! Thanks for nice script!
I want to protect all my videos - so they can be watched only for paid members.
I dont mean current packages,user registration and so on!
I want simply when someone open my site and click on video thumb - signup.php to be opened (I made this already,put limit to 0),so far so good...But on this signup.php -> I made mine which is explained about visitor payment and so on...
All is OK, but I need to make /member/ directory with .htaccess and .htpasswd as authentication, so 3rd billing parties can add/remove users... I spent few hours to think how can I make it, and the best I found is to protect /flv/ directory-where all flash videos are... but in this case when someone open page with video,screen will be blank and will be prompted for user/pass..BUT I NEED user to login on some place with his user/pass and then to watch site without problem...

Please,what you think it can be done?

I have to clarify that I need basicaly only users,loged with their user/pass (PROVIDED BY THIRD PARTIES,NOT RELATED WITH VSHARE SCRIPT) to be able to watch videos...others will see only thumbs...

Thanks in advance!!!

I'm ready to pay,just tell me how to do it,thanks again!