Bump.... ;)
Take a look at this thread:
http://p2p.wrox.com/topic.asp?TOPIC_ID=4772
It starts with a few examples that no longer work. However, on page 2, Richard York links to a few pages on Quirksmode.org. The first one explains how to do this.
No sure if that's the technique used by GMail, but I guess it's the same or similar.
Cheers,
Imar
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Imar Spaanjaars
Everyone is unique, except for me.