How to change style property in runtime

Hallo. I have this style tag in my main application:
<fx:Style>
     @namespace s "library://ns.adobe.com/flex/spark";
     @namespace mx "library://ns.adobe.com/flex/halo";
     @font-face {
     src: url("../caratteri/MyriadPro-Bold.otf");
     fontFamily: "MyriadPro-Bold";
     embedAsCFF: true;
     .mioStileMyriadProBold {
     fontFamily:MyriadPro-Bold;
     fontLookup: embeddedCFF;
</fx:Style>
It works good but i wish to change the fontFamily while the program is running. How can i do that?
Thx a lot.
Max

Hallo. Thx for the answer. I would like to know if your solution is working always. I mean, in my example i showed you that i have this:
.mioStileMyriadProBold {
fontFamily:MyriadPro-Bold;
fontLookup: embeddedCFF;
But what if i have 2 custom styles??.. How can i change one or another specifically ??
I hope you understand what i mean.
Max

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      7902 FORD       ANALYST         7566 03-DEC-1981       3000                    20
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