A few months ago I installed some Thai fonts on my mac book. I downloaded them from this site, and dragged them into Font Book. Unfortunately, one of the fonts I added replaced the default Thai font (used to be Ayuthaya) for MS Office and the Yahoo email compose letter field. Furthermore, Ayuthaya no longer appears on the drop down for MS Office, even though it's in Font Book.
Questions
1) How do I change the fonts back to how they were?
2) How do I add fonts without having this problem?
2. Don't download fonts from dodgy websites. I imagine fonts.com with a "zero" for the letter "o" is a good indication it's less than reputable. Also, use the free FontExplorer instead of FontBook; Font Book is AWFUL. (Sorry Apple, but it's true.)