为什么删除附件后就不能再添加了呢?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
table td a:link,table td a:visited{
text-decoration:none;
color:#0FF;
}
table,table td{
border:#0FF 1px solid;
}
</style>
<script type="text/javascript">
var count = 0;
function addFile()
{
count = ++count;
var tabNode = document.getElementsByTagName("table")[0];
var trNode = tabNode.insertRow(count);
trNode.id = "tr_"+count;
//alert(trNode.tagName);
var tdNode_file = trNode.insertCell();
var tdNode_del = trNode.insertCell(1);
tdNode_file.innerHTML = "<input type='file'/>";
tdNode_del.innerHTML = "<a href='javascript: void(0)' onclick='delFile("+count+")'/>删除附件"+count+"</a>"
}
function delFile(x)
{
var ids = "tr_"+x;
var trNode = document.getElementById(ids);
var tabNode = trNode.parentNode;
tabNode.removeChild(trNode);
}
</script>
</head>
<body>
<table>
<tr>
<td>
<a href="javascript:void(0)" onclick="addFile()">添加附件</a>
</td>
</tr>
</table>
</body>
</html>

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