Mac & pc font issue

hi there i have this site:

http://www.elemental.cl/REPCOM/repcom2

I made the process of load text dinamicaly in the same way taht i use to do it in a PC except that i did it in a MAC, then when i published the files it looks ok in the machine but when i uploaded to the server the text start to behave weird (missing ´ and ñ ).

Anyone know why is that… it is something about the codification of the .txt…? or it just a mac issue…?

theguaz.