A more accurate depiction of what the teams might see is here
http://www.bntnews.com/testit.html
or
http://www.bntnews.com/landingpage/landingpage.php
If you click the link, you should see the teams url show in the address bar and you should see the referer printed out.
So, the team will see the referer string from wherever the hit provider is sending from (since this is a mix of TGP and SE hits I would expect to see TGP and SE referers) Once we know the domains that the contestants are using then they will be killed if the script recievs them as a referer.
So, without the team knowing the url of the landingpage and only seeing the original referer string I don't think they can do much to cheat that part of it (although, yes tech gurus probably could figure a way around it, I am figuring the tech skills of the contestants as part of the overall security formula

)
The example script I posted was pretty much just to show the rotation aspect. I was hoping someone who knows more about php mysql would know perhaps a more efficient way to pull it off
Mr Benn. I might take you up on the volunteer aspect
Inabon volunteered Boldy, but I have not been able to grab the time to get back with them so I don't know what his time between now and next wednesday looks like
The second script is a touch more complicated (not much but a little). It will be capturing hits passed back from the teams and recycling them. So, it will have to capture a return hit and pass it to another team who is owed a hit.
I haven't decided what to do when no team is owed a hit yet. It will probably go to one of my domains or pass it to Nick
But the base structure is a mysql table with team, hitsin and hitsout defined.
It will get the hit, write hitsin to the appropriate team record and then grab the next team that is owed a hit and pass it on to them.