A-B Testing with AJAX

I am conducting an A-B test on my site and reporting the stats to Omniture. When the page initially loads, a call is made to Omniture with appropriate and relevant variables. However, the site uses AJAX controls that finish loading after the page is done rendering. Depending on the asynch data that comes back in the AJAX controls determines whether I should report recipe "A" or recipe "B" to Omniture.

How do I go about sending the A-B data from my AJAX control to Omniture after the initial page load has already sent variables to Omniture?

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