Vote API module

Anonymous vote rollover Immediately5 min15 min30 min1 hour3 hours6 hours9 hours12 hours1 day2 days4 days1 weekNever The amount of time that must pass before two anonymous votes from the same computer are considered unique. Setting this to 'never' will eliminate most double-voting, but will make it impossible for multiple anonymous on the same computer (like internet cafe customers) from casting votes.

This is not working .Could you please tell for solution for this

Regards Selvaraj.C