Forum:How to change font (between availables)

I just noticed that certain wikis are using diffrent fonts from default, and I find it interesting to apply to my own wiki. Could someone teach me how can I change basic font without using span tag?

my wiki : http://ko.seiyuu.wikia.com/wiki/Main_Page - using default "Gulim"

example of diffrent font : http://ko.pokemon.wikia.com/wiki/%EB%8C%80%EB%AC%B8 - using "AppleGothic"

(Both pages are in korean)