anchor.diff:  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   <html>
   	<head>
  -		<title>系统登录</title>
  +		<title>Sign up</title>
   		<meta http-equiv="pragma" content="no-cache" />
   		<meta http-equiv="cache-control" content="no-cache" />
   		<meta http-equiv="expires" content="0" />
  
positive.code: 			</tr>
  			</tbody>
  		</table>
  	<input type="submit" value="注册" >&nbsp;&nbsp;
  	<input type="button" value="返回" onclick="location.href='login.jsp'">
  	</form>
  	</center>
  	</div>
  
negative.code: </head>
  	<body>
  
  	<div align="center" class="style1 style2" ><b>Sign up</b>
  
  	<center>
  	<form action="registerResponse.jsp" method="post">
  		<table border="0" bgcolor="">
  			<tbody>
  			<tr>
  				<td height="58">Email*</td>
  				<td><input type="text" name="email" maxlength="30" style="width:150" required="required" pattern="[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?"></td>
  			</tr>
  			<tr>
  				<td height="58">Password*</td>
  				<td><input type="password" name="passwd" minlength="6" maxlength="20" style="width:150" required="required"></td>
  			</tr>
  			<tr>
  				<td height="58">Name*</td>
  				<td><input type="text" name="username" maxlength="20" style="width:150" required="required"></td>
  			</tr>
  			<tr>
  				<td height="58">Gender</td>
  				<td>
  				Male<input type="radio" name="sex" value="Male" />&nbsp;
  				Female<input type="radio" name="sex" value="Female" />&nbsp;
                  Others<input type="radio" name="sex" checked="selected" value="Others" />
  				</td>
  			</tr>
  			<tr>
  				<td height="58">Date of birth</td>
  				<td>
  				<SELECT onclick="onSelect(this)" name="year">
  				<%
  