Ajax and Adsense

Guys,

I've got a question on implementing Adsense with a dynamic content which uses ajax to change the content. So, let's say I have two DIVs that I put on the same page, the first DIV contains the dynamic content which is updated using Ajax, the second DIV is where I put my Adsense code.

My question is, how can I tell or maybe more precisely, how can the Adsense code knows that the content has changed, hence adjusting the ads accordingly ? Anybody got some tips and tricks on this subject ?

Thanks a lot !