function initialisedate(outday,outmonth,retday,retmonth)
{
    if (outday == "")
    {
        var outday=document.getElementById("Flightpod_outday").value;
        var outmonth=document.getElementById("Flightpod_outmonth").value;
        var calendar=new Date();
        var advpurchase=0;
        calendar.setDate((calendar.getDate())+ advpurchase);
        document.getElementById("Flightpod_outday").value=calendar.getDate();
        document.getElementById("Flightpod_outmonth").value=calendar.getFullYear() + "-" +(calendar.getMonth()+1);
        calendar.setDate(calendar.getDate()+ 7);
        document.getElementById("Flightpod_retday").value=calendar.getDate();
        document.getElementById("Flightpod_retmonth").value=calendar.getFullYear() + "-" + (calendar.getMonth()+1);
    }
    else
    {
       document.getElementById("Flightpod_outday").value = outday;
       document.getElementById("Flightpod_outmonth").value = outmonth;

       document.getElementById("Flightpod_retday").value = retday;
       document.getElementById("Flightpod_retmonth").value = retmonth;
    }
}