Yahoo and affiliate urls

[Kostyak]

Hi!
I need an advice from Yahoo experts. I have the next problem:
We manage an affiliate program and promoting our website on SE. For a long time I see how Yahoo crawls affiliate links and show them on SERPs. I need to see clear link without any FID. How could I disallow indexation for Yahoo only for URL with sessions and fids?
I have such strings in robots.txt:
Disallow: /?fid=
Disallow: /*?
But it doesn't help.

[vansterdam]

You may have to work at developing a steady link building program. You need your own domain to outrank the affiliate links. It may help to purchase a Yahoo directory listing.