删除当前table中的某个tr

<tr>
     <td><input type='button' size=5 value='删除' onclick="deleteCurrentRow(this)" />
     </td>
</tr>



function deleteCurrentRow(obj){
		var tr=obj.parentNode.parentNode;
		var tbody=tr.parentNode;
		if(tbody.rows.length<=1){
			closeSpec();
			return ;
		}
		tbody.removeChild(tr);
}