$continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
$continents[$continent]=1;
if (!isset($cities[$continent])) $cities[$continent]='';
$continent=substr($tz,0,$spos); $city=substr($tz,$spos+1);
$continents[$continent]=1;
if (!isset($cities[$continent])) $cities[$continent]='';