动态添加删除表格2

<script type="text/javascript">
//控制新增图片

var i=2;
var num;
function insRow()
{

x=ttb98.insertRow(ttb98.rows.length);
x.ln=i;

var num=document.getElementById('num').value;
var h1=x.insertCell(0);
var h2=x.insertCell(1);
h1.innerHTML="";

h2.innerHTML= "新增图片"+(i-1)+"&nbsp;：<input name='pictitle1"+(i)+"' type='text' onfocus=hidethis('pictitle1"+(i)+"') value='图片标题' id='pictitle1"+(i)+"'>"+"&nbsp;&nbsp;&nbsp;<span style='color:red;'>*</span>test<input type=button id='delete"+(i)+"' value= '删除 ' ln= " + i + " onclick= 'javascript:delRow(); '> "

if(i==11){alert('最多只能增加十行！');
document.getElementById('picup').style.display='none';
}

var num=document.getElementById('num').value;
num=i;
document.getElementById('num').value=num;
for(j=0;j<11;j++){
if(i>=3){
document.getElementById('delete'+(i-1)+'').style.display='none';
}
}
i=i+1;
x.bgColor="#ffffff"
//alert(i);
}
function delRow() //删除一行
{
line = parseInt(event.srcElement.ln,10);

if (line> 0){
for (j=1;j <ttb98.rows.length;j++) {
if (ttb98.rows[j].ln==line) {
ttb98.deleteRow(j);

i--;
num=i;
/* if(document.getElementById('delete'+(i-1)+'').style.display=''){
if(i==2){
alert('删除完成！');
}else{document.getElementById('delete'+(i-1)+'').style.display=''; }
}
*/

if(i==2){
document.getElementById('num').value=1;
}else{
num--;
document.getElementById('num').value=num;
document.getElementById('delete'+(i-1)+'').style.display='';
}


}
}
}
}

function hidethis(id){
document.getElementById(id).value="";
}

</script>

<table id="ttb98">
<tr>
<td>test page</td>
</tr>
</table>
<input type="text" value="1" name="num" />
<input id="picup" type='button' value="add" onclick="insRow()" >