If you try and trick the search engines you will get caught and be penalized. Maybe not today or tomorrow, but it will happen. Google, in particular, is very sophisticated when it comes to analyzing web sites.
Take a few tips from Google's Quality Guidelines:
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Make pages for users, not for search engines. Don't deceive your users or present different content to search engines than you display to users, which is commonly referred to as "cloaking."
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Avoid tricks intended to improve search engine rankings. A good rule of thumb is whether you'd feel comfortable explaining what you've done to a website that competes with you. Another useful test is to ask, "Does this help my users? Would I do this if search engines didn't exist?"
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Don't participate in link schemes designed to increase your site's ranking or PageRank. In particular, avoid links to web spammers or "bad neighborhoods" on the web, as your own ranking may be affected adversely by those links.
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Better yest, contact this company and ask them to give you the URL's of some of these hidden pages. Then see if these pages are indexed in Google, Yahoo, and MSN. If the page is indexed check to see if it is listed as "supplemental results". Google has been making a concerted effort to dump traditional (and junk) links pages from its index.