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Do you just want to keep the user logged in on your site while he/she goes from page to page? You could store that info into either a session variable or a cookie. If you do store passwords, always...

What language are you using? Did you want random records from a database referencing image URLs, or random images pulled directly from a folder?

MySQL has the "ORDER BY RAND()" function which does...

To prevent brute force password hacking, or at least slow it down, you could always store IPs with timestamps, and not allow multiple posts within 1 sec, or 5 sec, etc. You could even make a script...