ซ่อน textbox (Upload) ด้วย JavaScript แล้วส่งค่าไม่ไป

<script type="text/javascript"><!--
var gFiles = 1;
function addFile() {
var li = document.createElement('li');
li.setAttribute('id', 'file-' + gFiles);
li.innerHTML = '<input type="file" name="img[' + gFiles + ']" size="20"><span onclick="removeFile(\'file-' + gFiles + '\')" style="cursor:pointer;">&nbsp;&nbsp;<img border="0" src="/img/removr.png" width="10" height="10"></span>';
document.getElementById('files-root').appendChild(li);
gFiles++;
}
function removeFile(aId) {
var obj = document.getElementById(aId);
obj.parentNode.removeChild(obj);
}
--></script>

<DIV style="left: 35px; top: 15px; position: relative;">
<LABEL id="label-Pic">เลือกรูป :</LABEL>
<DIV style="left: 15px; position: relative; "><SPAN style="cursor: pointer;" 
onclick="addFile()"><IMG border="0" src="/img/add_small.png" 
width="16" height="16">&nbsp;Add</SPAN>
<OL id="files-root">
  <LI><INPUT type="file" name="img[0]" size="20"></LI></OL><FONT color="#ff0000" size="2">* 
</DIV></DIV>							</div>