jsp 局部变量重复问题

错误代码：
Common.jsp
<%@ page contentType="text/html;charset=gb2312" %><%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="java.text.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%
String title = "数据结构在线考试系统";
%>
index.jsp
<%@ page contentType="text/html;charset=gb2312" %>
<%@ include file="incoming/Common.jsp"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<title><%=title%></title>
<link rel="stylesheet" href="css/style.css" type="text/css" media="screen">
</head>
<body>
<%@ include file="Header.jsp"%>
</jsp:include>
<table width="780" border="0" align="center" cellpadding="0" cellspacing="0" bgcolor="#FFFFFF">
  <tr>
    <td width="120" valign="top" background="images/in_left_bg.gif"><%@ include file="Left.jsp"%></td>
    <td width="660" align="center"><p><font class="title2">欢迎进入数据结构在线考试系统</font></p>
    <p>&nbsp;</p></td>
  </tr>
</table>
<%@ include file="Footer.jsp"%>
</body>
</html>
foot.jsp
<%@ page contentType="text/html;charset=gb2312" %>
<%@ include file="incoming/Common.jsp"%>
<table width="780" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td width="780" height="70" background="images/bottom_arc_in2.gif" bgcolor="#F1F1F1"></td>
  </tr>
</table>
<table width="780" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td width="197" height="72">&nbsp;</td>
    <td width="386"><div align="center"><span class="txt"><span class="black"><%=title%>
    </span></span></div></td>
    <td width="197">&nbsp;</td>
  </tr>
</table>总说局部变量title重复，应该怎么改啊