How can I set an alert if the ping response time is over a threshold?

list Jason Hand
Wed, 6 Jan 2010 10:55:37 -0500
Message-Id: <user-18defdaf5636@xymon.invalid>

I want to alert on the CONN tag if the ping time is over lets say  
100ms.  Is anyone doing that and how did they accomplish it?

Thanks,
Jason