img图片没找到onerror事件

<script type="text/javascript">
<!--
	function nofind(){
		var img=event.srcElement;
		img.src="../../../sys/common/image/fileoperation/icon/default.gif";
	}
//没有找到时 用事件获取 一个一个获取
//-->
</script>

<td align="center"><img src="../../../sys/common/image/fileoperation/icon/${file.suffix }.gif" onerror="nofind();" />${file.name }</td>