help rendering latin symbols in w3

I see things like Encyclopædia
(E-n-c-y-c-l-o-p-Atilde-brokenbar-d-i-a) and Poincaré
(P-o-i-n-c-a-r-Atilde-copyright) on http://planetmath.org.

Do I need to change my default font encoding, or is there an option
for w3 that I can set that will make this work right?