The standard way to specifying fonts to create a list of fonts in order of preference, eg:
font-family: Tahoma, Arial, Helvetica, sans-serif
and then the browser will select the first one available. Hard coding fonts isn't ideal for accessibility (on my laptop for example I've set it to override the site font and always use Tahoma at 9pt to squeeze more text on screen) and embedding can lead to problems with users viewing with restricted rights, etc. who won't be able to download the font.
If you really want certain parts of the site to be in a specific font then consider using images instead - it's ok for menus, buttons, etc. but unworkable for body text.