Non repeating random banners

[goldoff]

Hi all

I installed this random banner

http://www.vbulletin.com/forum/showthread.php?t=170826

and it works perfect.

Now I am trying to make it with three banners simultaneously.

I mean, How to have three rotating, non repeating-at-same-time banners in the same page?

Something like this:

http://img236.imageshack.us/img236/944/provaun8.jpg

I've tried putting two more identical plugins (with the same banners) and changing the


$random_banner[$random_number]

for


$random_banner[$random_number2]

and


$random_banner[$random_number3]


But sometimes I get even three identical banners... How to make them "interact" and prevent repeating?

Thank you in advance.