diakritika v mail

Ako sa da narvat diakritika do mailu posielaneho cez php. namiesto niektorych znakov mi to zobrazuje ž. Skusal som cez premennu dat
$header="From: SOMETHING <nieco@cosi.sk>, Content-Type: text/html; charset=windows-1250"; a dat to do
mail( 'nieco@cosi.sk', 'predmet', "tex mailu", $header); ale zobrazi mi ako odosielatela v maili: "SOMETHING, Content-Type: text/html; charset=windows-1250" a zobrazuje tie kocky stale.
vopred dik

takto by to malo ist:

$header = "From: SOMETHING <nieco@cosi.sk>"."Content-Type: text/html; charset=windows-1250";