var popupwindow

popupwindowdisplayed = false

function OtworzOkno(addr, name, wndwidth, wndheight)
{
	if( popupwindow && !popupwindow.closed )
		popupwindow.close()
	popupwindow = open(addr, name, 'width='+wndwidth+',height='+wndheight+',toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1');
	popupwindow.focus()
}