The acronym tag seems to be NetScape 6.2 and IE 4.
Also, it uses the title="" attribute which would be the similar
to the alt="" for images and the title="" for <a> elements.
The javascript seems like it would be the best way to go.
I think the length of the title="" attribute is determined by
the browser used. Some might have a 255 character limit,
some might truncate it if reaches the edge of the page. I'm
not really sure how different browsers handle it, and I'm
pretty sure that w3 doesn't specify a determinate length.
The information about the browser versions and tags is
available at:
http://www.w3schools.com/html/html_reference.asp
There is some excellent information available about javascript,
html, xhtml, xml, and most everything associated with the Internet
available at:
http://www.w3schools.com/
Enjoy!
--
Jim Carlock
(e-mail address removed)
http://www.microcosmotalk.com/
I don't know but with a little .css for cursor control they're pretty cool.