var win=null;
function otworz(adres,nazwa,s,w,scroll)
{
	if (w>screen.height-50){w=screen.height-50;}
	lewa=(screen.width-s)/2;
	gora=(screen.height-w)/4;
	parametry='width='+s+',height='+w+',top='+gora+',left='+lewa+',scrollbars='+scroll+',location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
	win=window.open(adres,nazwa,parametry);
	if(win.focus){win.focus();}
}
function zamknij(){if(win!=null && win.open)win.close()}
window.onfocus=zamknij;