function obrazek_admin(id) 
{
    w=777;
    h=860;
    cx=(screen.height - w)/2;
    cy=(screen.width - h)/2;
    Fokus = window.open('img.php?id=' + id, 'jmeno','resizable=0,top=' +  cx +',leftmargin=0,topmargin=0,left=' + cy +',menubar=0,topmargin=0,align=center,width=' + w + ',height=' + h);
    
    Fokus.focus()
}