Help with logon scripts

Hi, 
I have a user database made in postgresql, that stores the user id and
password
what I need now is to ask for the username and password, check it and
grant access to an index.html page.

I also use it with php.

Any sugestions?
Thanks.
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____________________________
Marcio Macedo
marciom@conectiva.com.br
Conectiva Internet Solutions
It's Red Hat Linux !!!