function FlightsTypeChange(arg1)
{
    //if(arg1==document.getElementById("FlightsType").value) return;
    if(arg1=="DomesticFlights"){//国内机票查询
    document.getElementById("DomesticCheck").style.display="";
    document.getElementById("FlightsType").value = arg1;
    document.getElementById("OrgCity1").style.display="";
    document.getElementById("DstCity1").style.display="";
    document.getElementById("OrgCityDeparture").style.display="none";
    document.getElementById("DstCityDestination").style.display="none";
    document.getElementById("DomesticFlights").parentNode.setAttribute("className","mouseon");
    document.getElementById("InternationalFlights").parentNode.setAttribute("className","mouseoff");
    document.getElementById("DomesticFlights").parentNode.setAttribute("class","mouseon");
    document.getElementById("InternationalFlights").parentNode.setAttribute("class","mouseoff"); 
        if(document.getElementById("FlightType1").checked == true){
            SelectAirLine("O");
        }
        else if(document.getElementById("FlightType2").checked == true){
            SelectAirLine("R");
        }
        else if(document.getElementById("FlightType3").checked == true){
            SelectAirLine("M");
        }
    }
    else{
    document.getElementById("DomesticCheck").style.display="none";
    document.getElementById("FlightsType").value = arg1;
    document.getElementById("OrgCity1").style.display="none";
    document.getElementById("DstCity1").style.display="none";
    document.getElementById("OrgCityDeparture").style.display="";
    document.getElementById("DstCityDestination").style.display="";
    document.getElementById("DomesticFlights").parentNode.setAttribute("className","mouseoff");
    document.getElementById("InternationalFlights").parentNode.setAttribute("className","mouseon");
    document.getElementById("DomesticFlights").parentNode.setAttribute("class","mouseoff");
    document.getElementById("InternationalFlights").parentNode.setAttribute("class","mouseon"); 
    SelectAirLine("O");
    }
}