SharePoint registration limit

I have to create a SharePoint registration form for a class that has a limit of 20 people.
How can I stop registration after 20 people have registered?

It has to be a no-code solution so, I can't use event receivers.

I'm using SP 2007.
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IsaacSharePoint Client Side DeveloperAsked:
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Jamie McAllister MVPSharePoint ConsultantCommented:
This contains a workflow that does this;

http://www.microsoft.com/Download/en/details.aspx?id=21363

A slight fix is mentioned here to support when users de-enrol.

http://paulgalvinsoldblog.wordpress.com/2007/10/11/employee-training-schedule-and-materials-template-decrement-bug-in-the-template/


I'd suggest you copy or replicate the approach.
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