<form name="form" method="post" enctype="multipart/form-data" target="editpost" ID="Form1">
<select class="TBGen" name="SelectFile" style="width:200"></select>
<button onclick="DelFiletoSelect()">刪除</button>
<span id="AffixFile">
 <span><input style="width:10" name="affixs" type="file" onpropertychange="AddFiletoSelect(this)"></span>
</span>
</form>
<SCRIPT LANGUAGE="JavaScript">
 function AddFiletoSelect(aoFile){
   if ((aoFile==null)||(aoFile.value=="")) return;
   var loOpts = form.SelectFile.options;
   loOpts[loOpts.length] = new Option(aoFile.value,aoFile.uniqueID);
   aoFile.parentElement.style.display = "none";
   var loObj = document.createElement("span");
   loObj.innerHTML = '<input style="width:10" name="affixs" type="file" onpropertychange="AddFiletoSelect(this)">';
   AffixFile.insertBefore(loObj);
 }
 function DelFiletoSelect(){
  loEL = document.all(form.SelectFile.value);
  if (loEL!=null){
   loEL = loEL.parentElement;
   AffixFile.removeChild(loEL);
  }
  var loOpts = form.SelectFile.options;
  if(loOpts!=null&&loOpts.length>0){
   loSel = loOpts[form.SelectFile.selectedIndex]
   loOpts.removeChild(loSel);
  }
 }
</SCRIPT>