I want to create a site with Authentication.If i enter my site  url in browser first the login page should Display. After providing correct  credentials it will show my site pages........how to do this..........

I want to give only my site url to others. They dont have any salesforce login account or anything. They have only browser. they should enter the crediatials given by me and enter to the site.

i am using Developer Edition....Is it possible to do like this...........

Plz reply..i eagerly waiting for reply............