Ping tests and alerts

Is there any way to modify the ping tests to only go red if a server is
not responding to ping tests for more than 15 minutes?  Some of the
servers I need to test are on the west coast and sometimes don't respond
right away to the first ping due to net conditions.  I only want it to
go red if it's been down for longer than 15 minutes.

P.S.
    Apologies if this is posted twice.

-- 
Jeff Stuart
Network Admin
MyInternetServices
1-800-300-HOST
X-XXX-XXX-XXXX


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