Voting System - How to avoid automatic voting scripts?

[ghjr]

One quick questions regarding php based voting systems:

1. The voting script is going to be called from a flash file. I guess I can use HTTP_REFERER to check that out in most cases but would there be a more reliable way to ensure that whatever is accessing the voting script is actually the flash file.

I just want to make sure people don't make any scripts and have it automatically vote. Maybe I'll just make it so that votes can only come from the same IP address every 2min or so.

Cheers,
ghjr

[ragedigital]

Just create a graphic that contains a short alpha-numeric code that the user will have to enter - similar to what phpbuilder.com uses when creating an account.