keepalive configuration

I've played with some of the demo apps on the mod-pubsub.org site and on 
a test server that we've setup here.  When sniffing the connection, I 
find that from the mod-pubsub site javascript keepalive messages are 
sent once every 15 - 30 seconds, whereas the same app from our test 
server sends them about once per second.  Is this configurable?  Our 
test server is running apache 1.3 whereas I notice mod-pubsub.org has 
2.0.  Any hints will be much appreciated.  Please cc this email address 
as I'm not subscribed to the mailing list.

Zachary



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