CSS does overide the text size function of the IE browser.... no easy way round it really other than to just specify a font using the font tag, and leave the size up to the users browser.... you can also make use of the other size tags like h1, h2, etc.
I know with
css you can specify text as bigger / smaller and this may be a way forward, although it is nothing I have really looked at before.
Can anyone else shed any light on this?