The web sites used a relatively simple trick. A known loophole in the Google algorithm is that a web page that redirects to another web page will get the PageRank number of the redirected web page.
Code: 
http://www.searchenginepromotionhelp.com/m/articles/link-popularity-improvement/fake-google-page-rank.php
http://www.checkpagerank.net/index.p...tcha_code=wg9g
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