Duplicate comtent

[tanveer1]

How can I differentiate

http://aa-rental.com/Audio Recorders.asp?cat=28

from

http://www.aa-rental.com/Audio Recorders.asp?cat=28

For some reasons crawl is understanding them as two different pages. Help will be very much appreciated.

[SEO5Team]

Go into Google Webmaster tools and choose the way you want google to index the site. Choose either the www or the non www version of the domain name. This should fix it.

http://support.google.com/webmasters/bin/answer.py?hl=en&answer=44231

[Matt-Williamson]

You have a duplicate content issue that is because of your pages being available on the www. version and none www. version of the page - to correct this I would look at placing a 301 redirect from the none www. to the www. version and this will fix the issue.

Here is some information on 301 redirects -

http://www.seomoz.org/learn-seo/redirection

I would also make the selection on Google Webmaster Tools as SEO5 says

[Vahe.Arabian]

Tanveer, Matt is correct. A best answer for him!

[tanveer1]

I set no preference, will it matter?

Right now I submitted both versions in the webmaster. But preferred non www.