ciml - 5:51 pm on Nov 7, 2002 (gmt 0)

Personally I would steer clear of the Javascript reload/replace approach. Google won't follw the Javascript redirect or see the replacement content, but if Google decide at some point that Javascript redirects are a problem then you could get caught up in a filter of some sort.

If you have the same content available at both addresses, and normally use the www address, then sites pointing to you without the 'www' will be counted for your www PageRank if the two addresses were identified as by Google duplicates and merged.

You can check the Google cache for each URL to see if Google merged the records. The "This is G o o g l e's cache of ..." line will be the same if they are merged.

If they're not merged, then I would suggest a 301 status HTTP redirect (if you control your hosting) or the BASE href approach mentioned by Black_Knight.