Adjust style on ABBR or ACRONYM alternate text

I am using the ACRONYM tag to provide an explanation of codes within my 
application.  Example:

        <p>The circuit <acronym title="Circuit P123T: Picton SS to
Telebary 
SS 345KV">P123T</acronym> is out
        of service from 13:00 to 15:00 today</p>.

I would prefer a fancy balloon tip, but this allows me to store and
retrieve 
the text directly in a database table, and avoid having to add any 
additional setup text to create any invisible balloon text. (Unless there
is 
another way).

I would like to change the style of the alternate text that appears, such
as 
increasing its font size and background color.  Is there a way to do this
as 
CSS or in JavaScript ?

Thanks,
Jarson (jarson from sygration, that's a dot com company if you would like
to 
email me)