User style sheet for replacing several varieties of Arial with Helvetica Neue.

helvetify.css

@font-face {
    font-family: 'Arial';
    src: local('HelveticaNeue');
}

@font-face {
    font-family: 'Arial';
    font-weight: bold;
    src: local('HelveticaNeue-Bold');
}

@font-face {
    font-family: 'Arial';
    font-style: italic;
    src: local('HelveticaNeue-Italic');
}

@font-face {
    font-family: 'Arial';
    font-weight: bold;
    font-style: italic;
    src: local('HelveticaNeue-BoldItalic');
}

@font-face {
    font-family: 'Arial Unicode MS';
    src: local('HelveticaNeue');
}

@font-face {
    font-family: 'Arial Unicode MS';
    font-weight: bold;
    src: local('HelveticaNeue-Bold');
}

@font-face {
    font-family: 'Arial Unicode MS';
    font-style: italic;
    src: local('HelveticaNeue-Italic');
}

@font-face {
    font-family: 'Arial Unicode MS';
    font-weight: bold;
    font-style: italic;
    src: local('HelveticaNeue-BoldItalic');
}

/* OS X doesn't ship with these weights of Helvetica Neue out of the
 * box; these replacements instead refer to Adobe variants, and thus
 * won't work unless you have them installed.
 */

@font-face {
    font-family: 'Arial Black';
    src: local('HelveticaNeueLTStd-Blk');
}

@font-face {
    font-family: 'Arial Black';
    font-weight: bold;
    src: local('HelveticaNeueLTStd-Blk');
}

@font-face {
    font-family: 'Arial Narrow';
    src: local('HelveticaNeueLTStd-Cn');
}