Changing font properites within an application


The CSS tutorial was a very good insight into the basic use of CSS in Flash.

I basically want to know how I may go about changing the font properties from within a Flash application.

So say I load a swf file (like an options/settings screen with size, color, type settings) into an mc, how do I then change the font properties for all text boxes located on different scenes based on what the user chose on that screen?