date validation

 <tr>

                        <SELECT name="departure_date">

        <OPTION value="01" selected>01</OPTION>

        <OPTION value="02">02</OPTION>

        <OPTION value="03">03</OPTION>

        <OPTION value="04">04</OPTION>

        <OPTION value="05">05</OPTION>

        <OPTION value="06">06</OPTION>

        <OPTION value="07">07</OPTION>

        <OPTION value="08">08</OPTION>

        <OPTION value="09">09</OPTION>

        <OPTION value="10">10</OPTION>

        <OPTION value="11">11</OPTION>

        <OPTION value="12">12</OPTION>

        <OPTION value="13">13</OPTION>

        <OPTION value="14">14</OPTION>

        <OPTION value="15">15</OPTION>

        <OPTION value="16">16</OPTION>

        <OPTION value="17">17</OPTION>

        <OPTION value="18">18</OPTION>

        <OPTION value="19">19</OPTION>

        <OPTION value="20">20</OPTION>

        <OPTION value="21">21</OPTION>

        <OPTION value="22">22</OPTION>

        <OPTION value="23">23</OPTION>

        <OPTION value="24">24</OPTION>

        <OPTION value="25">25</OPTION>

        <OPTION value="26">26</OPTION>

        <OPTION value="27">27</OPTION>

        <OPTION value="28">28</OPTION>

        <OPTION value="29">29</OPTION>

        <OPTION value="30">30</OPTION>

        <OPTION value="31">31</OPTION>

        </SELECT>

        <SELECT name="departure_month">

        <OPTION value="January" selected>January</OPTION>

        <OPTION value="February">February</OPTION>

        <OPTION value="March">March</OPTION>

        <OPTION value="April">April</OPTION>

        <OPTION value="May">May</OPTION>

        <OPTION value="June">June</OPTION>

        <OPTION value="July">July</OPTION>

        <OPTION value="August">August</OPTION>

        <OPTION value="September">September</OPTION>

        <OPTION value="October">October</OPTION>

        <OPTION value="November">November</OPTION>

        <OPTION value="December">December</OPTION>

        </SELECT>

        <select  name="departure_year">

        <option value="2004" selected>2004</option>

        <option value="2005">2005</option>

        <option value="2006">2006</option>

        <option value="2007">2007</option>

        </SELECT>

        </td>