function openLoginWindow(url) {
	var left=(screen.width-600)/4;
	var top=(screen.height-400)/4;
	if(left<0 || top<0) return true;
	var params='width=600,height=400,toolbar=no,' 
		+'scrollbars=yes,resizable=no,status=no,'
		+'location=no,directories=no,menubar=no,'
		+'left='+left+','
		+'top='+top;
	var new_window=window.open(url,'wizard',params);
	if(new_window == null) {
	    alert("Błąd otwarcia:"+url);
	    return false;
	} 
	new_window.focus();
	return false;
}

function closeLoginWindow(url) {
	if(url.length>0) self.opener.location=url;
	else self.opener.location.reload();
	window.close();
	return false;
}