RedRum,
With yahoo you can do it with<div class=”robots-noindex”>Their Name</div>
or<div class=”robots-nocontent”> Their Name </div>
Not sure if Bing respects this as Yahoo results are being supplied buy bing though...
For Google that's a bit harder. Unfortunately, the only way to guarantee it is to use an image. I seem to remember Matt Cutts in a video pretty much all or nothing in regards to a page.
But you could ask on the G Webmaster forums and see if they have a better answer.
Cheers,
Rich