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Javascript links can be done a couple of ways, they are snippets of code that use javascript commands to launch a sponsor url. Typically they are onclick eventhandlers.
The purpose is to try to make the sponsor link invisible to the spider and conserve the pr of the page.
Jeka, when the rel="nofollow" command first started to be promoted by google, it was described as being for blogs, there was a lack of knowledge about how it was to be used so you heard a lot of warnings against it.
But, various google reps have been mentioning it more frequently, usually in connection to 'paid links', as a way to avoid "voting" for the paid link.
Since these reps have been pretty much officially promoting it, it is probably safe to use.
But, you should study it a bit for yourself, and make your own decision.
Is it any real advantage? That's hard to say. Again, you have to decide for yourself.
Do you want to "vote" for your sponsor? Or not?
I think we'll probably be hearing a lot more about this question soon, if the rumors have any truth to them at all.
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