Hi All
We have a couple of clients that have changed their company name since we first built their web sites way back when. The companies now wish to use new url's (already set up as alias's) for these sites to reflect their new name. The original existing url has been indexed fairly comprehensively in Google. The clients want the original url's to no longer be indexed by the search engines. They want Google to only index the domain name we have set up as an alias.

What is the easiest way to swap over to using the new domain with out dropping out of the Google index for a protracted period of time.
Thanks Yours Willie Whelan