You have to use this resource reference inside of a font-face instruction, as in my :
Code:
@font-face {font-family: "Caecilia", serif;font-weight: normal;font-style: normal;src: url(res:///Data/fonts/CaeciliaLTStd-Roman.otf);}
@font-face {font-family: "Caecilia", serif;font-weight: bold; font-style: normal;src: url(res:///Data/fonts/CaeciliaLTStd-Bold.otf);}
@font-face {font-family: "Caecilia", serif;font-weight: bold; font-style: italic; src: url(res:///Data/fonts/CaeciliaLTStd-BoldItalic.otf);}
@font-face {font-family: "Caecilia", serif;font-weight: normal;font-style: italic; src: url(res:///Data/fonts/CaeciliaLTStd-Italic.otf);}
@font-face {font-family: "FontinSans", sans-serif;font-weight: normal;font-style: normal;src: url(res:///Data/fonts/Fontin_Sans_R_45b.otf);}
@font-face {font-family: "FontinSans", sans-serif;font-weight: bold;font-style: normal;src: url(res:///Data/fonts/Fontin_Sans_B_45b.otf);}
@font-face {font-family: "FontinSans", sans-serif;font-weight: bold;font-style: italic;src: url(res:///Data/fonts/Fontin_Sans_BI_45b.otf);}
@font-face {font-family: "FontinSans", sans-serif;font-weight: normal;font-style: italic;src: url(res:///Data/fonts/Fontin_Sans_I_45b.otf);}
This code forces the use of the Caecilia font for all serif font declarations in the following and inherited CSS, and the use of FontinSans in lieu of all other sans-serif fonts.
Hope this helps,
Dave.