I always assume that unless it is a Text Link or a Linked Image and Not a JS Rollover, then it is unlikely to be crawled by ALL the Spiders. Sometimes this means that I am taking a "Better Safe than Sorry£ approach, but that suits me. If you use something that makes all your pages for you and that will include links and code etc then generally you have little control over the "Goodness" of what you end up with without lots of customisation. I am glad I produce all my own stuff including CMS so I don't have this worry.
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