Ajax --- Avg. Time on Page Not Recorded ---

Hello,

I am finding no good way to get Piwik to recognize when the user has left an ajax loaded page.

I am using jQuery.ajax to load the pages of interest.
I am able to post tracking information to Pwik using the following code:

However, when the user leaves the ajax page, no record is kept of it and no time is noted when the user leaves.

Does anyone have a solution for this ?

Thanks.

Jay
CompuMatter