动态添加附件上传按钮

 <table id="tbAccessory" height="0" cellSpacing="0" cellPadding="0" width="663" align="center"
        bgColor="#ccccff" border="0">
        <tr>
         <td>
          <p id="MyFile"></p>
         </td>
        </tr>
       </table>

<script>
var iFileCount=0;
function add()
{
 iFileCount=iFileCount+1;
 var addCell = new Array();
 
 if(iFileCount<4)
 {
  if(iFileCount==1)
  {
   document.all.btAccessory.value='继续粘贴附件';
  }
  if(iFileCount==3)
   document.all.btAccessory.value='粘贴附件';
   var str = '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<INPUT type="file" size="50" NAME="File">&nbsp;&nbsp;<input type=button name=del value=删除 onclick=delFile('+iFileCount+')><br>';
  addCell[0]=str;
  runRowInsert(tbAccessory, addCell);
  //document.getElementById('MyFile').insertAdjacentHTML("beforeEnd",str);
  //document.getElementById('tbAccessory').insertAdjacentHTML("beforeEnd",str);
 }
 
}
function delFile(index)
{
 if(iFileCount==1 && index>0)
  tbAccessory.deleteRow(1);
 else
  tbAccessory.deleteRow(index);
 iFileCount=iFileCount-1;
 //alert(iFileCount.toString());
}
function runRowInsert(TableHandle, GetCells, RowIndex){
 var oRow = null;
 var oCel = null;

 if (typeof(GetCells) != 'object' || GetCells.length == 0){
  alert('错误信息:\n* 没有任何数据需添加!');
 }else{
  if (typeof(RowIndex) != 'number'|| RowIndex < 0){
   oRow = TableHandle.insertRow();

  }else{
   if (RowIndex < TableHandle.length){
    oRow = TableHandle.insertRow(RowIndex);
   }else{
    oRow = TableHandle.insertRow();
   }
  }
  for (var i = 0; i < GetCells.length; i++){
   oCel = oRow.insertCell();
   oCel.innerHTML = GetCells[i];
  }
 }
 return oRow;

}
  </script>