var helvetica = {
  src: '/fileadmin/img/site/sIFR_helvetica_all.swf'
};

sIFR.activate(helvetica);

sIFR.replace(helvetica, {
  selector: '#mainblock h1'
});

sIFR.replace(helvetica, {

  selector: '#mainblock h2',
  src: '/fileadmin/img/site/sIFR_helvetica_all.swf',
  css: {'.sIFR-root': {'font-weight': 'bold'}}
});