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:

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

PHP Code:

$random_banner[$random_number] 

for

PHP Code:

$random_banner[$random_number2] 

and

PHP Code:

$random_banner[$random_number3] 

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

Thank you in advance.