Rachel has already posted the right code to do that. Just exchange the fontnames here:
font: bold 20px FONT, Backup-FONT, Backup-Backup-FONT;
Don’t forget to use “”-signs around a font if it has spaces inbetween.
font: bold 20px font, “backup font”, “backup backup font”;
also, feel free to delete bold or change it to italic and to vary the size of the font.