Is it possible to block/prevent search engines from spidering PART of a page?

I know how to seal off part/all of a website. My question here is: if I let a search engine spider get to a page can I separate the page into 2 parts: allowed for spidering and DISallowed?

If yes, how do I accomplish that?

thanks,
dave

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Dave Barnes
+1.303.744.9024
http://www.marketingtactics.com
sitting in my basement with my iMac