function initialisedate(outday,outmonth,retday,retmonth)
{
    if (outday == "")
    {
        var outday=document.afpForm.ctl00$Mainbooking1$outday.value;
        var outmonth=document.afpForm.ctl00$Mainbooking1$outmonth.value;
        var calendar=new Date();
        var advpurchase=0;
        calendar.setDate((calendar.getDate())+ advpurchase);
        document.afpForm.ctl00$Mainbooking1$outday.value=calendar.getDate();
        document.afpForm.ctl00$Mainbooking1$outmonth.value=calendar.getFullYear() + "-" +(calendar.getMonth()+1);
        calendar.setDate(calendar.getDate()+ 7);
        document.afpForm.ctl00$Mainbooking1$retday.value=calendar.getDate();
        document.afpForm.ctl00$Mainbooking1$retmonth.value=calendar.getFullYear() + "-" + (calendar.getMonth()+1);
    }
    else
    {
        document.afpForm.ctl00$Mainbooking1$outday.value = outday;
        document.afpForm.ctl00$Mainbooking1$outmonth.value = outmonth;

        document.afpForm.ctl00$Mainbooking1$retday.value = retday;
        document.afpForm.ctl00$Mainbooking1$retmonth.value = retmonth;
    }
}