求教！ExtJS布局中Grid始终显示不出来！

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"  contentType="text/html;charset=utf-8"%>
<%@ page import="java.sql.*" %>
<%@ include file="logincheck.jsp" %>
<%
 String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
//int IssueID = Integer.parseInt(request.getParameter("IssueID"));
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

<script type="text/javascript" src="js/issue/familyGrid.js"></script>
  </head>
  <body> 
 
<div id="familyGrid"></div>
  </body>
</html>忘了JSP的代码