Google Adsense and Yahoo Publisher on same forum... How?

[GotVtec]

I have attempted to do this. I added the code to my global.php file:

$randomads = rand(1,2); //Display Google(1) or Yahoo (2)

Then I added this to my templates:

<if condition="$randomads == 1">
//Show Google Ads
<else />
//Show Yahoo Ads
</if>

But, I still get both displayed in my forums: http://www.v6performance.net/forums/

It seems as if the ones in under each forum, are always defaulted to 2.