@font-face {       /* this rule before next                            */
    font-family: customfont;
    src: url(foo); /* EOT file for Internet Explorer                   */
}                  /* http://code.google.com/p/ttf2eot/ is your friend */
@font-face {       /* this rule after previous                         */
    font-family: customfont;
    src: url(bar); /* TrueType or OpenType file                        */
}
html {             /* this rule anywhere you like                      */
    font-family: customfont, helvetica, arial, sans-serif;
}                  /* make your own fonts: http://fontforge.sf.net/    */