使用colorbox.js中的ajax提交表单

Im using a form inside colorbox.js popup window. I want to submit the data using ajax but it doesn't work.

here is the link i click to show the popup colorbox.js window:

<a href="demande-emploi.php" class="ajax cboxElement" title="Demande d'emploi">Demanded'emploi</a>

here is the content of (demande-emploi.php) file:

<div style="height:450px; width:580px; padding:30px 10px; margin: 0 auto;">   
     
    <div id="message"></div>

    <form action="" method="POST">
        <div class="clearfix">                                        
            <div class="input">
                <label class="labels"> Poste à offrir:</label>
                <input type="text" id="poste_to_offre">
            </div>
        </div>                    
        <div class="clearfix">                                        
          <div class="input">
              <label class="labels"> A propos:</label>
                  <textarea rows="9" id="apropos" class="textareas"></textarea>
          </div>
        </div>
            
        <div class="input">
            <label class="labels">Ville:</label>
            <input type="text" name="ville">
        </div>                    
        <div class="clearfix">                                        
            <div class="input">
                <label class="labels">Tél/GSM:</label>
                <input type="text" id="tel">
            </div>
        </div>    
                
        <div class="clearfix">                                        
            <div class="input">
                <label class="labels"> Adresse:</label>
                <textarea rows="3" id="address" class="textareas"></textarea>
            </div>
        </div>                
        <br>
        <button type="submit" class="wpb_btn-small" id="send">Envoyer</button>
    </form>   
</div>

Here, I just want to test if the callback of the ID=send will respond or not but it doesn't work.

<script>
    $(document).ready(function(){

        $("#send").on('click',function(e){
            e.preventDefault();    
            $("#message").html("Blah Blah Blah......");
        });
    });
</script>
</div>