Print PDF invoices problem with greek characters.

[atsolakid]

when i generate the PDF invoice in english/french there are not any prolem, but when i generate it in greek
it prints the following characters:

IN000003 απIOE 2009-08-11
ΠαραγγελI.α #000006ΜεταφορI&
alpha;ς:ΤρIOEπος Πλ&PARTSALAKI;ΚατI¬θεση ΠεριγραφI® ΑναφορI¬

chracetrs that can not be understand

what to do?

[nmoussas]

when you find how to solve this pleise let me know!!