[NTG-context] Different fontsize in header and footer

I thought I saw it once, but I can not find it. I like to use another fontsize in my headers and footers. At the moment I have solved it in this way: \setupfootertexts[{\switchtobodyfont[6pt]Pagina \pagenumber \space van \lastpage}] But then I have to do this everywhere I change the text for header/footer. Is there a way to set the fontsize (and font) globally? -- Cecil Westerhof