Well, if I view the html source of the page you linked to above, and search for 'data-zone="ron" data-format="300x250"', I find it once, but occasionally I'll find it twice. So it kind of seems to me like it might be working, but I don't see any ads at all on that page.

Edit: Also (possibly related), when I look at the JS console I see this:

Something doesn't seem quite right. For 1 in 3, I am now at 9 out of 13.

OK, well maybe there's something about the way it works that I don't understand. Anyway, here's another one you can try:

That one doesn't work too well for me because strangely some of the digits of what's supposed to be the current time with microseconds don't change from one page to another. But apparently it's OS dependent and I'm running on my home Windows 7 computer, so it might work better for you.

Edit:...otherwise, it's not too difficult to write a plugin that does an actual random number.

How do I reverse the condition?

I have an advert showing if condition=x. But I want to stop showing an advert in another location is condition=x. So, what is the reverse?

Edit:Worked it out. Use != instead of ==