How to stop Bots crawling content of section of the page ?

[poseidon]

I don't want Search engine bots to crawled the content of section of the page. How can I do that ?

I can stop crawlers(like Googlebot) crawling pages/directories using robots.txt but how to stop them from crawling only a part of the page ?

for example, I don't want googlebot to crawl the header and the footer of my site. Is there anyway to achieve this ? If not in PHP, than can I do it with javascript ?

Cheers

[Costin Trifan]

Source: Yahoo!
Title: Introducing Robots-Nocontent for Page Sections
Url: http://www.ysearchblog.com/archives/000444.html