以下是引用片段：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>ajax注册应用</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script language="javascript" src="js/common.js"></script>
<script language="javascript" src="js/prototype.js"></script>
<script language="javascript" src="js/passwordstrength.js"></script>
<script language="javascript" src="reg.js"></script>
<style type="text/css">
<!--
body,td,th,div,input {
font-family: Courier New, Courier, mono;
font-size: 12px;
}
body {
margin: 0px;
}
.FrameDivPass{
background-color: #F7F7F7;
border: 1px solid #EEEEEE;
padding: 2px;
height: 100%;
float: left;
}
.FrameDivPass input{
background-color: #FFFFFF;
width: 150px;
float: left;
border: 1px solid #6FBE44;
}
.FrameDivPass div{
color: #999999;
float: left;
margin-right: 5px;
margin-left: 10px;
height: auto;
width: auto;
display: block;
}
.FrameDivWarn{
background-color: #FFFBE7;
border: 1px solid #B5B5B5;
padding: 2px;
height: 100%;
float: left;
}
.FrameDivWarn input{
background-color: #FFFFFF;
width: 150px;
float: left;
border: 1px solid #FF0000;
}
.FrameDivWarn div{
color: #333333;
float: left;
margin-right: 5px;
margin-left: 10px;
height: auto;
width: auto;
display: block;
}
.FrameDivNormal{
border: 1px solid #FFFFFF;
padding: 2px;
height: 100%;
float: left;
background-color: #FFFFFF;
}
.FrameDivNormal input{
background-color: #FFFFFF;
width: 150px;
float: left;
border: 1px solid #999999;
}
.FrameDivNormal div{
color: #333333;
float: left;
margin-right: 5px;
margin-left: 10px;
height: auto;
width: auto;
display: block;
}
#checkBtn{
float: left;
}
#checkDiv{
color: #333333;
float: left;
margin-right: 5px;
margin-left: 10px;
height: auto;
width: auto;
display: block;
}
-->
</style>
<script language="javascript">
var icon = '<img src="images/warning.gif" width="14" height="14" border="0" align="absmiddle">';
var ns = ["usr","pwd","repwd","eml"];
function changeUsr(){
if($("checkBtn").disabled) $("checkBtn").disabled = false;
}
function checkUsr(s){
var ma = ["用户名（3-16位）！","用户名由数字、英文、下划线、中杠线组成！"];
if(!limitLen(s,3,16)){
showInfo("usr",ma[0]);
return false;
}
if(!hasAccountChar(s)){
showInfo("usr",ma[1]);
return false;
}
showInfo("usr");
return true;
}
function checkPwd(s){
var ma = ["密码（5-16位）！","密码不能包含中文或全角符号！","两次输入的密码不一致！"];
ps.update(s);
if(!limitLen(s,5,16)){
showInfo
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