小菜鸟在线求助，大虾们帮帮忙

是登陆问题
代码： 
      <%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.sql.*" %>
<html>
<head>
<script language="javascript" type="text/javascript">
<!--
function onClick()
{
 this.location.replace("register.jsp");
 }
-->
</script>
<title>用户登录                                                                                                                                                                                </title>
<style type="text/css">
<!--
.STYLE1 {
color: #333333;
font-weight: bold;
font-size: large;
}
-->
</style>
</head>
<body>
<% 
try
{
String strId="";
String strName="";
String strPassword="";
String strMsg="";session.setAttribute("loginId","");
strId=request.getParameter("id");
strPassword=request.getParameter("password");if(strId!=null && strPassword!=null && !strId.equals("")&&!strPassword.equals(""))
{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); 
Connection con=DriverManager.getConnection("jdbc:odbc:yunshu");
     Statement statement=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);  
       ResultSet rs=null; 
String String_SQL="select id from sjinfo where id='"+strId+"'  and  password='"+strPassword+"'";
rs=statement.executeQuery(String_SQL);
if(!rs.next())
{strMsg="你输入的用户名或密码不正确，请重新输入！";out.println("123"+strMsg);
%>
<script language="javascript" type="text/javascript">
<!-- 
alert("重新输入");
-->
</script>
<% 
}
else
{
session.setAttribute("loginId",strId);
response.sendRedirect("main.jsp");
      rs.close();
      statement.close();
      con.close();
     }
    }
}
catch(Exception e)
{
out.println("错误"+e.getMessage());
}
%>
<center>
<span class="STYLE1">司机登陆</span><br>
<table border="1" bodercolor="royalbule" bgcolor="lightblue" width="400">
<tr><td>用户号：</td><td><input type="text" name="id"></td></tr>
<tr><td>密码：</td><td><input type="password" name="password"></td></tr>
</table>
<input type="submit" value="登录">
<input type="reset" value="重填">
<input type="button" onClick="onClick()" value="注册"><!-- 去登记 -->
</form>
</center>
</body>
</html>数据库： ID                  主
         sj_name
         sj_sex
         sj_phone
         sj_address
         sj_password 用户名和密码输进去后  点确定没反应
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