please someone tell what font is used on the first page and the inside pages here

I see this forum it has different font type on the first page and the inside pages.

please can some one tell me what font type and font size is used here on this first page http://bbshowcase.org/forums/

please can some one tell me what font type and font size is used here on this inside page in the post http://bbshowcase.org/forums/topic/pagination-in-front-page-latest-discussions-how

I will be very grateful..