That only works for IE in a Windows OS. Netscape, Mozilla, and IE 5 for the MAC will enlarge the text no matter how you specify it, whether in relative sizes, pixel sizes, point sizes, or percentage sizes.
There really is no way to absolutely control font sizes on all browsers. I usually try to lay out pages so that it can accomodate large text sizes and not have the layout break apart.
The bottom line, don't count on sizing a table cell or DIV to display one line of 14pt text because someone on Netscape or IE/ Mac can resize the text thru the View menu. It could wrap text to a different line.
Then again, if that really doesn't matter to you, disregard the above paragraph