本人最近在做一个留言版块，遇到了以下问题，百思不得其解。
追求的效果是这样的：点击一个留言的回复按钮，在该留言下方弹出回复界面，同时交替按住不同留言的回复，回复窗口可以交替出现。
留言部分是用ajax显示的。回复按钮的js为：
var flag=1;
function open_response(obj){
var Pnode=obj.parentNode;
if(flag%2)
{
var Cnode=document.createElement('div');
Cnode.id="response";
Cnode.innerHTML="<div align='center'><textarea name='response_comment' rows='5'></textarea></div>"+
"<div class='name'>用户名: <input type='text' name='response_name' style='width:80px' /> 邮箱: <input type='text' name='response_email'></div>"+
"<div>"+
"<input type='submit' name='response_submit' class='submit' value='回 复' />"+
"</div>"+
"<div style='clear:both'></div>";
Pnode.appendChild(Cnode);
Cnode.style.display=="block"?Cnode.style.display="none":Cnode.style.display="block";
flag=0;
}
else
{
close_response(Pnode)
}
}
function close_response(obj)
{
var Cnode_1=document.getElementById('response');
obj.removeChild(Cnode_1);
flag=1;
}
结果是交替现象失效，ie浏览器提示的是参数无效，chrome提示：Uncaught NotFoundError: An attempt was made to reference a Node in a context where it does not exist.
------解决方案--------------------
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
var flag=1;
function open_response(obj){
var Pnode=obj;
if(flag%2)
{
var Cnode=document.createElement('div');
Cnode.id="response";
Cnode.innerHTML="<div align='center'><textarea name='response_comment' rows='5'></textarea></div>"+
"<div class='name'>用户名: <input type='text' name='response_name' style='width:80px' /> 邮箱: <input type='text' name='response_email'></div>"+
"<div>"+
"<input type='submit' name='response_submit' class='submit' value='回 复' />"+
"</div>"+
"<div style='clear:both'></div>";
Pnode.appendChild(Cnode);
Cnode.style.display=="block"?Cnode.style.display="none":Cnode.style.display="block";