font-sizes resize in Firefox unwantedly but not in IE

I’m worried about a user coming to my webpage and using their browser options to enlarge text in the browser unwantly. Most text looks great even with the user’s increasement, however some text I don’t want the user to be able to resize.

Using PT measurements in widths and heights remains uneffected by the user’s custom text-sizes in their browsers on both Firefox and IE:

[code]
<div style=”width:50pt;height:200pt;background-color:green”></div>
[/code]

However, using PT in the font-sizes effect Firefox and the text will grow or shrink (but not in IE):

[code]
<div style=”width:50pt;height:200pt;font-size:15pt;background-color:green”>15pt</div>
[/code]

My Question is does anyone know some kind of special font-size that won’t enlarge or shrink in either IE or Firefox?
I’m looking for a solution similar to this that would make Firefox not able to change the text sizes:

[code]
font-size:15px/100em;
[/code]

Of coarse that won’t do it but I got the idea from Yahoo when I came across this:

[code]
body{font:84%/1.2em arial,sans-serif;}
[/code]

Can you think of any solution to keep the text-size in Firefox the same size regardless how they use CTRL(+) and CTRL(-) thanks!

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