function okno_foto() 
{
 window.open ("", "Foto", "width=715, height=540, top=10, left=10, menubar=no, location=no, toolbar=no, resizable=no, scrollbars=no, status=no, directories=no");
}

function okno_materialy() 
{
 window.open ("", "Materialy", "width=625, height=625, top=10, left=10, menubar=no, location=no, toolbar=no, resizable=no, scrollbars=no, status=no, directories=no");
}

function okno_priprava() 
{
 window.open ("", "Priprava", "width=720, height=545, top=10, left=10, menubar=no, location=no, toolbar=no, resizable=no, scrollbars=no, status=no, directories=no");
}