这个怎么改成jquery？
<!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>
<script type="text/javascript">
function f1(){ //新增行
var i=0
var Mytable=document.getElementById('Mytable');
var objrow = Mytable.insertRow(1);
for(i=0;i<4;i++){
var objcell = objrow.insertCell(i);
objcell.innerHTML = document.getElementById("td"+i).innerHTML;
}
}
function f2(){
var inputs=document.getElementsByTagName('input');
var Mytable=document.getElementById('Mytable');
var a=[];
for(var i=0;i<inputs.length;i++){
if(inputs[i].type=='checkbox'){
a.push(inputs[i]);
}
}
for(var i=a.length-1;i>=0;i--){
if(a[i].checked){
Mytable.deleteRow(i+1);
}
}
}
</script>
</head>
<body>
<table id="addButton1" name="x-btn">
<tr>
<td class="x-btn-center">
<button type="button" hidefocus="true" class="x-btn-text add" onclick="f1()">新增行</button>
</td>
</tr>
<tr>
<td class="x-btn-center">
<button type="button" hidefocus="true" class="x-btn-text delete" onclick="f2()" >删除行</button>
</td>
</tr>
</table>
<table id="Mytable" >
<thead>
<tr>
<th width="30px" align="center">
<div>选择</div></th>
<th align="center">
<div>行号</div></th>
<th align="center">
<div>本次退货数量</div></th>
<th align="center">
<div>本次退货数量</div></th>
</tr>
</thead>
<tbody id="tab1" style="display:">
<tr class="odd">
<td id="td0">
<input type="checkbox" name="checkbox1" value="1" id="checkid">
</td>
<td id="td1">
<input type="TEXT" />
</td>
<td id="td2">
<input type="TEXT" />
</td>
<td id="td3">
<input type="TEXT" />
</td>
</tr>
<tr class="odd" style="display:none">
<td id="td0">
<input type="checkbox" name="checkbox1" value="1" id="checkid">
</td>
<td id="td1">
<input type="TEXT" />
</td>
<td id="td2">
<input type="TEXT" />
</td>
<td id="td3">
<input type="TEXT" />
</td>
</tr>
</tbody>
</table>
</body>
</html>
<!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>
<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js'></script>
<script type="text/javascript">
function f1(){ //新增行
var Mytable=$('#Mytable'),last=Mytable.find('tr:last') ;
Mytable.find('tr:eq(1)').before( last.clone().show() );
}
function f2(){
$('#Mytable :checkbox:checked').parents('tr').remove()
}
</script>
</head>
<body>
<table id="addButton1" name="x-btn">
<tr>
<td class="x-btn-center">
<button type="button" hidefocus="true" class="x-btn-text add" onclick="f1()">新增行</button>
</td>
</tr>
<tr>
<td class="x-btn-center">
<button type="button" hidefocus="true" class="x-btn-text delete" onclick="f2()" >删除行</button>
</td>
</tr>
</table>
<table id="Mytable" >
<thead>
<tr>
<th width="30px" align="center">
<div>选择</div></th>
<th align="center">
<div>行号</div></th>
<th align="center">
<div>本次退货数量</div></th>
<th align="center">
<div>本次退货数量</div></th>
</tr>
</thead>
<tbody id="tab1" style="display:">
<tr class="odd">
<td id="td0">
<input type="checkbox" name="checkbox1" value="1" id="checkid">
</td>
<td id="td1">
<input type="TEXT" />
</td>
<td id="td2">
<input type="TEXT" />
</td>
<td id="td3">
<input type="TEXT" />
</td>
</tr>
<tr class="odd" style="display:none">
<td id="td0">
<input type="checkbox" name="checkbox1" value="1" id="checkid">
</td>
<td id="td1">
<input type="TEXT" />
</td>
<td id="td2">
<input type="TEXT" />
</td>
<td id="td3">
<input type="TEXT" />
</td>
</tr>
</tbody>
</table>
</body>
</html>
$(function(){
$('#addButton1 .add').click(function(){
var copy=$('#tab1 tr:hidden').eq(0).clone().show();
copy.insertBefore($('#tab1 tr:hidden'))
})
$('#addButton1 .delete').click(function(){
$('#tab1 :checkbox:checked').parents('tr').remove()
})
});
