Sorry I have a problem.
I went to
http://www.fontsquirrel.com/fontface and I downloaded the @font-face kit I have choosen (Cousine) from this url
http://www.fontsquirrel.com/fonts/cousine
Then I uploaded to the /fonts dir under the template directory in joomla and in the template manager I setted Cousine-Bold-Latin-webfont in "Font Squirell font name - headers" parameter.
I have also another parameter "Font Squirell font directory - headers" but I didn't understand exactly what I have to insert.
If I check in Firebug at the html element, I have font-family = Cousine-Bold-Latin-webfont but it is not showing that font in the browser.
Regards