Fonts?

i have a font called PETRASCRIPT EF i downloaded. and for some reason its not compatable with my osx operating system?
and its vital i get this working cause i need it to do my job for www.myspace.com/tamichynn

does anyone know why this font wont seem to work its .ttf :S
im confused it worked on the old mac i had and thats like way way old also, even when i visit other wbesites it wont even loa the font does anyone have a clue? please help!

http://www.scrapvillage.com/fontsp.htm

That TFF file works for me in FontBook and Linotype Font Explorer

Do you get a message saying that it's not compatible or are you just assuming?