voting script

Hi, I'm not sure if this has a PHP solution or not, I thought I'd bounce it off the people of this group though... I have a site that gives users the ability to vote on sections of the site. This is done by a php script that adds 1 to the "vote" field on a MySQL database. What I want to do is have a system that stops people from voting on each section more than once (i.e. cheating). I was going to do something that logged their ip for each section and would stop multiple votes -- this would cause problems for people behind company firewalls though, and also cause *huge* logs. Then I thought maybe sending a cookie when they voted that would notify the script if they tried to vote again -- this seems like the most feasible idea *I* have come up with so far, I was wondering whether anyone has had better solutions for a similar situation though? Thanks in advance for any help, Robert Morrissey -- Crazy Moose http://www.crazymoose.co.uk Providing Web Design, Hosting and IT Support