How to change default domain name url

webwater <[email protected]> 11 Sep 2003 00:24:14 -0000

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Currently my url for my catalog is http://mydomain.com/catalog.
Which file or files do I need to change to have my catalog listed as http://www.mydomain.com/catalog

There must be a place that I can add the www. in front of my domain. 

Thanks