How to fix font and font size in CKEditor

I want to force Tahoma, 10pt in the CKEditor widget. Do anyone know how I can do that? Thanks!
Never tried it but there must exist a default setting that you can assign to via javascript.

Googling for it, maybe you can have a look at:

The js variable that holds the config for the default OS CKEditor component is CKEDITOR.config if I'm not mistaken.

Hope this helps,