dofollow and nofollow is for crawlers, and crawlers don't execute javascript.
By default links are dofollow, if you want a link to be nofollow, you will need to add "manually" the rel="nofollow" to the link.
If you want all links on a page to be nofollow, then you can add a meta-tag in the header of the document:
Quote:
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<meta name="robots" content="nofollow">
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You can't do it with javascript.