function addDays(DIn,DOut,days) {

    var dateStrIn = document.getElementById(DIn).value;

    var dateValueIn = new Date(dateStrIn.substring(6,10),dateStrIn.substring(3,5)-1,dateStrIn.substring(0,2));

    var daysToAdd = parseInt(document.getElementById(days).value) * 86400000;

    var dateValueOut = new Date(parseInt(dateValueIn.getTime())+daysToAdd);

 
    if (parseInt(dateValueOut.getMonth()+1) < 10) {
        var monthOut = '0' + parseInt(dateValueOut.getMonth()+1);
    }else{
        var monthOut = parseInt(dateValueOut.getMonth()+1);
    } 
    if (parseInt(dateValueOut.getDate())<10) {
        var dateOut = '0' + parseInt(dateValueOut.getDate());
    }else{
        var dateOut = parseInt(dateValueOut.getDate());
    }

    var dateStrOut = dateOut + '/' + monthOut + '/' + dateValueOut.getFullYear(); 
    document.getElementById(DOut).value=dateStrOut;
}