Yahoo! is very restrictive on allowing AutoComplete to function on most all of it's pages. I found the following quote...
"Yahoo mail turns off the autocomplete feature for their web based mail."
...in the link which follows, which gives a good tutorial on how AutoComplete works in general, as well as giving helpful hints on how to utilize A-C in your coding if you're a programmer.
http://www.geocities.com/technofundo...ocomplete.html
The summary is... you can't use AutoComplete with your Yahoo! Mail, DCarr.
I know... it's a pain!! :lol: I wish Yahoo! allowed A-C to be used there, too.

A.M.