พี่ครับทำไม select เวลา insert ลงฐานข้อมูล มันลงไปแค่ตัวเดียวอ่ะครับพี่

  <script src="http://www.google.com/jsapi" type="text/javascript"></script>    
<script type="text/javascript">    
google.load("jquery", "1.3.2");    
</script>    
<script type="text/javascript">    
$(function(){    
    $("select#Datalist").change(function(){  
        if($("select#Datalist option:selected").val()=="add"){  
            $("select#Datalist").hide();  
            $("input#addList").show();  
            $("input#addButton").show();  
        }  
    });  
    $("input#addButton").live("click",function(){  
        var newOption="<option value=\""+$("input#addList").val()+"\" selected=\"selected\">"+$("input#addList").val()+"</option>";  
        $("select#Datalist").show();  
        $("select#Datalist option:last").after(newOption);  
        $("input#addList").val("").hide();  
        $("input#addButton").hide();  
    });  
});    
</script>   
<td>
                        <select name="Datalist" id="Datalist">
                        <option value="">--เลือก--</option>
                        <option>Soft Skill</option>
                        <option>Management Skill</option>
                        <option>Development Skill</option>
                        <option>Application Server Admin Skill</option>
                        <option>Standard Skill</option>
                        <option>Network Skill</option>
                        <option>Server Admin Skill</option>
                        <option>Application Specialist</option>
                        <option>Domain Expert</option>
                        <option>General Technical Skill</option>
                        <option value="add">เพิ่มข้อมูล</option>
                        </select>
                        <input type="text" name="addList" id="addList" style="width:180px;display:none;" />  
  <input type="button" name="addButton" id="addButton" value="Add" style="display:none;"  />  
                      </td>