I am designing my new personal web site that is practically based only on typography (a sort of swiss style inspiration). The site is all set on Helvetica, but I know most of my visitors are Windows users and do not have it installed (and even if they had it, I think the rendering of Helvetica on a Windows browser wouldn't be nice at all).
So I tried the fabulous Typeface script to replace my text and still make it accessible and gracefully degradable. My first choice was use Helvetiker, a ready-to-go Helvetica-like (actually Helvetica-clone) type, based on MgOpen Moderna, but there's a serious problem: the font does not have some special characters I need, like cedilla (ç) and some accents (á, for example). These characters are essential for me, since the site has its main version on Portuguese.
I cannot use Helvetica itself since it is not embeddable. So anyone knows another free typeface very similar to Helvetica that has special characters?