session problem help me please

[Azeem12]

i am setting session for a user
when a user login it redirect to staff.php file in the start of staff.php there msg should display welcomes to the staff area and my user namee
i mean if i login with name azeem then it shud say welcome to staff area ,azeem
problem is this when i hit login button it takes me to staff.php area with this warning or error msg kindly help methis is the msg i got
Staff Menu
Welcome to staff Area.,
Notice: Undefined index: username in C:\wamp\www\az\staff.php on line 14
this is my few lines of code where i set my session
code is

if ( empty($errors) ) {	

$query = "SELECT id,username ";

$query .= "FROM users ";	

$query .= "WHERE username = '{$usrname}' ";

$query .= "AND hashed_password ='{$hashed_password}' ";	

$query .= "LIMIT 1";

$result_set=mysql_query($query);
confirm_query($result_set);

if(mysql_num_rows($result_set)==1){

$found_user=mysql_fetch_array($result_set);

$_SESSION['user_id']= $found_user['id'];

$_SESSION['username'] =$found_user['username'];

redirect("staff.php");
} else {

$message="username/Password combination incorrect.<br/>

check may be caplocks is on and try again.";
}

and in staff.php i m calling it this session is like this

<td width="891" align="left" bgcolor="#FFFFFF" id="pages">
                    <h2>Staff Menu</h2>
                    <p>



Welcome to staff Area.,<?php echo $_SESSION['username'];?></p>

[dagon]

do you have:

session_start();

on staff.php ?

[Azeem12]

yes it is

[halojoy]

It is important you have session_start()
in both pages.
We must have where
1. we set session values
2. where we read / display session values

[Azeem12]

in both the pages there is session_start();
i have one made file session .php
inside it
there is just one command

session_start();

and im just including it i hope it is not because of this i have include it on both pages from login.php and in staff.php

[dagon]

what does the following return?

print_r($_SESSION);

[Pikachu2000]

" $query .= "WHERE username = '{$usrname}' "; <---- Is this spelled right? 'usrname' Everywhere else in the code you have it spelled 'username'.