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Well, there's a simpler way to display all of the disabled services http://roshamboot.org/main/?p=74 (see the serviceprops section)... but I don't know if that's what you are actually after. It's a rather unique scenario... I don't think there's too many people who are concerned with checking if a service is set to disabled... because it's (normally) a manual process.
Out of mere curiousity more than anything, why do you need to do this?
If you're on the same machine as your Nagios server, you could grep the status.dat file instead of the web interface. Also, if you're using ndoutils you could pull that information from the database.