function isnumeric(n){
   return !isNaN(parseFloat(n)) && isFinite(n);
}

function get_flights(limit,search,from_city,to_city,day,flight_date,from_form){


    if (search == null || search === undefined)
        search = 'arr';

    var query='';

    query = 'limit='+limit+'&search='+search;
    
    if (isnumeric(day))
        query += '&day='+day;
    
    if (isnumeric(from_city))
        query += '&from_city='+from_city;

    if (isnumeric(to_city))
        query += '&to_city='+to_city;
    if (flight_date)
        query += '&flight_date='+flight_date;
    
    if (from_form)
        query += '&from_form=1';
    
    jQuery.ajax({

                async:false,
                type: "GET",
                url: "get_flights.php",
                data: query,
                beforeSend: function(){
                   jQuery("#airport_schedule").html('');
                   jQuery("#airport_schedule").css('background','#222222 url("images/ajax_loader.gif") center center no-repeat');
                },
                success: function(result){
                      jQuery("#airport_schedule").html(result);
                      jQuery("#airport_schedule").css('background','#222222');
                },
                error: function(){
                    alert("Error loading");
                }

     });
  
}