Javascript datefunction to get date

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Javascript

I have a text box in which i have entered some date i want in another text box in which i want to display the date after one week. i am using javascript function but it unfortunately and didn't solve my problem because the month returns by the function is one less than the current month.

Here is the code which i have written.

<script type="text/javascript">
        function validNumber(e) {debugger;
            keyPressed = e.keyCode;
            if (keyPressed < 48 || keyPressed > 57) {
                return false;
            }

            return true;
        }
        function gettodate(todate) {
           // debugger;
            if (Validatetxt_fromdateformat()) {
                debugger;
                var fromDate = document.getElementById('txt_fromdate');
                var Month = fromDate.value.split("/")[0];
                var temp = new Array();
                temp = todate.split('/')
                var myDate = new Date(temp[2], temp[0], temp[1]);
                myDate.setDate(myDate.getDate() + 7);
                var curr_month = myDate.getMonth();
                if(Month < curr_month) {
                    curr_month--;
                }
                var curr_date = myDate.getDate();

                // if (curr_month == 0)
                //curr_month = curr_month + 1;
                //curr_month = curr_month + 1;
                if (curr_month == 0) {
                    curr_month = 12;
                }
                var curr_year = myDate.getFullYear();
                document.getElementById('txt_todate').value = curr_month + '/' + curr_date + '/' + curr_year;
            }
            else {
                document.getElementById('txt_todate').value = "";
            }
        }
        function Validatetxt_fromdateformat() {//debugger;
            var fromDate = document.getElementById('txt_fromdate');
            var toDate = document.getElementById('txt_todate');
            var Month = fromDate.value.split("/")[0];
            var date = fromDate.value.split("/")[1];
            var year = fromDate.value.split("/")[2];
            if ((Month < 0 || Month > 12) || (date < 1 || date > 31) || (year.length != 4)) {
                alert("Invalid date.Please enter correct Date(MM/DD/YYYY)");
                fromDate.focus();
                toDate.value = "";
                return false;
            }
            else
                return Month;
        }
        function Disabletodate() {debugger;
            var toDate = document.getElementById('ctl00_ContentPlaceHolder1_txt_todate');
            toDate.enabled = true;
        }

I need ur help...
Thanks in advance......