> I was wondering if anyone out there who knows a little bit more about 
> how this works could give me some pointers.

This is a 30-second idea dump:

You need to find the JS code that gets called whenever the mail window 
switches to a new message. You need to extract the email address at that 
point (it should be floating around somewhere), do 
document.getElementById('collapsedfromValue').setAttribute('tooltiptext'
, emailAddress);

Gerv


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