function init() {
    new Ajax.Autocompleter(
        "flying_destination",
        "update_arrivee",
        "/airports.php",
        {
            method: 'get',
	     paramName: 'city',
            minChars: 3,
	     frequency: 0.15,
	     afterUpdateElement : function (input, li) {
                document.form_flying.iata_arrivee.value = li.id;
            }
        });

    new Ajax.Autocompleter(
        "flying_origin",
        "update_depart",
        "/airports.php",
        {
            method: 'get',
	     paramName: 'city',
            minChars: 3,
	     frequency: 0.15,
	     afterUpdateElement : function (input, li) {
                document.form_flying.iata_depart.value = li.id;
            }
       });

}