venunath - Use example.com as the sample domain to illustrate the canonical problems you're experiencing.
Or, is this a multiple domain issue? If so, we would need more description and information, but not the specific domains.
Before you post, take a look at the Hot Topics [webmasterworld.com] section, pinned to the top of the Google SEO forum home page. It has a whole section on duplicate content issues.
(Note that we suggest example.com because it can never be owned. The forum's software works well with it and doesn't auto-link when you use it).