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I've got a new client and I'm trying to clean up their backlinks. There are several links that all redirect to this spam site http://www.expert-lender.com. All of the websites appear to be real, i.e. http://www.sammorganhomes.com/ but the actual links i.e http://www.sammorganhomes.com/wp-fav/backup/supplement/semitruckleasing.html are in a sub-directory and redirect to the spam site. I don't know if these links were from the previous SEO company or if they paid someone to create these or if these sites have been hacked. Can anyone tell me what is going on here and what should I tell these site owners?

I'm working on a site that has four primary navigation links and under each is a tabbed navigation system for second tier items. The primary link page loads content for all tabs which are javascript controlled. Users will click the primary navigation item "Our Difference" (http://www.holidaytreefarm.com/content.cfm/Our-Difference) and have several options with each tabs content in separate sections. Each second tier tab is also available via sitemap/direct link (ie http://www.holidaytreefarm.com/content.cfm/Our-Difference/Tree-Logistics) without the js navigation so the content on this page is specific to the tab, not all tabs. In this scenario, will there be duplicate content issues? And, what is the best way to remedy this? Thanks for your help!