Service check on DOWN hosts!!!

[Sergio Ariel]

I have some services (in different hosts) I check by Nagios.
Some of these service checks spend some seconds to execute, so, I've set 
  a window time according each time execution. For example: I've some 30 
seconds timeout service check.
My problem is that when these host are DOWN, Nagios wait 30 seconds 
trying to execute the service check. After this 30 seconds, then tell me 
   "CRITICAL SERVICE". I want to avoid Nagios checks any service in DOWN 
host.
Please, how can I get it?
I want Nagios don't execute any service check until host is UP again.

Thanks.
-- 
Sergio Ariel de la Campa Saiz
    Administrador Red UH

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