How's this?
http://www.mightymitedoggear.com/images/mrbunaframe.jpg
Check out my links page under "agility." I've listed sources of information - focusing on small dogs and yorkies. You MUST check out the workingyorkie message board website listed there.
Here's a video clip of Mr. Bun and friends in action (although it wasn't one of our finer moments!):
http://www.wesh.com/community/3460674/detail.html
Yorkies can be great at agility! In fact, a recent Yorkie milestone - Sharon Thompson Edwards Yorkie was the first Teacup Dog Agility Association Teacup Agility Champion! Pam Shelby has a Yorkie who has (I hope I have this right since they are always getting new MACHSs!) Master Agility Chamption (AKC) 3 Yorkie!
Here's the link:
http://www.mightymitedoggear.com/linkstraining.html