Anyone know the address of Apple's update server?

We're trying to set up our clients to first point to our own xserve then, should it for some reason be unavailable, to check apple's. We're not quite sure how to do this but it should look something this right?:
http://<our server address>:http://<apple's server address>
Is this correct?

Perhaps a little more clarification would help
We are using Work Group Manager to create computer groups for our client computers. On one of the computer groups we select the group, then go to System Preferences -> Software Update.
We set it to be Always managed and provide the URL for our xserve that will be hosting the service. we would also like to specify for this group of computers that if our server crashes and they are unable to access the server for updates, that they should point to Apple's update server instead. Would just like some advice on how to do this.

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