删除当前行的JS代码！请大家帮我看看。急！！！！
我要通过按钮删除当前行，该怎么样执行！代码如下！请大家帮我看看。急！！！！

var   currRowIndex   =   0;
function   del(objTD)
{
      var   objTR   =objTD.parentElement
        currRowIndex=   objTR.rowIndex;
      alert(currRowIndex);
      var   objTable   =   document.getElementById( "t ");
      if(confirm( "确定删除? "))
      {
            objTable.deleteRow(currRowIndex);
            currRowIndex   =   0;
      }
}


<table>

<tr   id=a1>
<td> 1111 </td>
<td>
<button   type= "button "   name= "b1 "   onClick= "javascript:del(this) "> del </button>
</td>
</tr>

<tr   id=a2>
<td> 222222222 </td>
<td>
<button   type= "button "   name= "b2   onClick= "javascript:del(this) "> del </button>
</td>
</tr>

<tr   id=a3>
<td> 3333333333 </td>
<td>
<button   type= "button "   name= "b3 "   onClick= "javascript:del(this) "> del </button>
</td>
</tr>
</table>


------解决方案--------------------
<script>
var currRowIndex = 0;
function del(objTD)
{
var objTR =objTD.parentElement.parentElement;
currRowIndex= objTR.rowIndex;
alert(currRowIndex);
var objTable = document.getElementById( "t ");
if(confirm( "确定删除? "))
{
objTable.deleteRow(currRowIndex);
currRowIndex = 0;
}
}
</script>

<table id= "t ">

<tr id=a1>
<td> 1111 </td>
<td>
<button type= "button " name= "b1 " onClick= "del(this) "> del </button>
</td>
</tr>

<tr id=a2>
<td> 222222222 </td>
<td>
<button type= "button " name= "b2 " onClick= "del(this) "> del </button>
</td>
</tr>

<tr id=a3>
<td> 3333333333 </td>
<td>
<button type= "button " name= "b3 " onClick= "del(this) "> del </button>
</td>
</tr>
</table>
------解决方案--------------------
<script>
var currRowIndex = 0;
function del(objTD)
{
var objTR =objTD.parentNode.parentNode;
currRowIndex= objTR.rowIndex;
if(confirm( "确定删除? "))
{
objTR.parentNode.deleteRow(currRowIndex);
currRowIndex = 0;
}
}
</script>

<table id= "t ">

<tr id=a1>
<td> 1111 </td>
<td>
<button type= "button " name= "b1 " onClick= "del(this) "> del </button>
</td>
</tr>

<tr id=a2>
<td> 222222222 </td>
<td>
<button type= "button "