Fonts

[Ikon Design]

Hi All

I'm operating Indesign CS2 on G4 500MHZ OS Tiger, On thursday I was  
working on a document and all fonts were present, this morning they  
had disappeared though they are visible in the font file in the  
library. I have moved the fonts to the font file in Indesign and they  
are now usable . Because the fonts are now in two place I would like  
to know the correct location for them and why they would not work  
from the library font file.
Thanks in advance
Em