What I am wanting to do is add this script to my main one meaning take all the coding and at it to it. That way once the user logs in it will send them to the control panel. How do I do this?

This is control panel script.

PHP Code:
<html>
<
head>
    <
title>Backstage V2 Administration Console</title>
    <
link rel="stylesheet" type="text/css" href="style.css">
</
head>
<
body>
<
table cellspacing="0" cellpadding="0" width="100%">
    <
tr>
        <
td valign="top" width="150"><!-- Start Navigation -->
        <
table class="navigation" cellspacing="0">
            <
tr>
                <
th>Character</th>
            </
tr>
            <
tr>
                <
td>
                <
a href="#">Bio</a>
                <
a href="#">Allies</a>
                <
a href="#">Rivals</a>
                <
a href="#">Quotes</a>
                </
td>
            </
tr>
            <
tr>
                <
th>Submit</th>
            </
tr>
            <
tr>
                <
td>
                <
a href="#">Roleplay</a>
                <
a href="#">News</a>
                <
a href="#">Match</a>
                <
a href="#">Seg</a>
                </
td>
            </
tr>
            <
tr>
                <
th>Handler</th>
            </
tr>
            <
tr>
                <
td>
                <
a href="#">Directory</a>
                </
td>
            </
tr>
            <
tr>
                <
th>Booking</th>
            </
tr>
            <
tr>
                <
td>
                <
a href="#">Champions</a>
                <
a href="#">Booker</a>
                <
a href="#">Compiler</a>
                <
a href="#">Archives</a>
                </
td>
            </
tr>
            <
tr>
                <
th>Fed Admin</th>
            </
tr>
            <
tr>
                <
td>
                <
a href="#">Handlers</a>
                <
a href="#">Characters</a>
                <
a href="#">Applications</a>
                <
a href="#">Event Names</a>
                <
a href="#">Title Names</a>
                <
a href="#">Match Types</a>
                <
a href="#">Divisions</a>
                <
a href="#">Arenas</a>
                </
td>
            </
tr>
            <
tr>
                <
th>Site Admin</th>
            </
tr>
            <
tr>
                <
td>
                <
a href="#">Templates</a>
                <
a href="#">Content</a>
                <
a href="#">Bio Configuration</a>
                <
a href="#">News Categories</a>
                <
a href="#">Menus</a>
                </
td>
            </
tr>
        </
table>
        </
td><!-- End Navigation -->
        <
td valign="top">

        <!-- 
Main Content -->
        <
h3>Upcoming Events</h3>

        <
h2>Great American Nightmare</h2>

        <
h3>Maintenance</h3>
        <
h2>Records Requiring Editing</h2>
        <!-- 
End Main Content -->
        
        </
td>
    </
tr>
</
table>
</
body>
</
html
This is my main script.

PHP Code:
<?php 

require ('database.php');

//if the login form is submitted
if(isset($_POST['login']))
{
    
// makes sure they filled it in
    
if(!$_POST['username'] || !$_POST['pass'])
    {
        die(
'You did not fill in a required field.');
    }
    
$username mysql_real_escape_string($_POST['username']); 
    
$pass mysql_real_escape_string($_POST['pass']); 

    
$check mysql_query("SELECT * FROM users WHERE username = '".$username."'")or die(mysql_error());

    
//Gives error if user dosen't exist
    
$check2 mysql_num_rows($check);
    if (
$check2 == 0)
    {
        die(
'That user does not exist in our database.');
    }
    while(
$info mysql_fetch_array$check )) 
    {
        
$pass md5(stripslashes($_POST['pass']));
        
$info['password'] = stripslashes($info['password']);
        
//$_POST['pass'] = md5($_POST['pass']); THIS IS DONE IN THE ABOVE STATEMENT
        //gives error if the password is wrong
        
if ($pass != $info['password'])
        {
            die(
'Incorrect password, please try again.');
        }
        else 
        
        
// if login is ok then we add a cookie and send them to the correct page
        

            
$username stripslashes($username); 
            
session_start();
            
$_SESSION['username'] = $username
            
$_SESSION['loggedin'] = time();
            
            
// Finds out the user type
            
$query "SELECT `authlevel` FROM `users` WHERE `username` = '" $username "'";
            
$result mysql_query($query) or die(mysql_error()); 
            
$row mysql_fetch_array($result); 
            
$authLevel $row['authlevel'];
            
$_SESSION['authlevel'] = $authLevel;
        
            
// Sends them to correct page after login
            
if($authLevel == "2")
            {
                
$page "admin.php";
            }
            else
            {
                
$page "backstage.php";
            }
            
header("Location: $page"); 
        } 
    } 

else 

// if they have not submitted the form
?> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Backstage V1 Administration Console</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<?php include('backstage.css'); ?>
</head>
<body>
<div id="login"> 
<center>
<h1>KOW Backstage</h1><br>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<p>Username:</p>
<input type="text" name="username" maxlength="40" size="40">
<br><br> 
<p>Password:</p>
<input type="password" name="pass" maxlength="50" size="40"> 
<br><br>
<input type="submit" name="login" value="Login >>"><br><br>
</form>
</center>
</div>  
</body>
</html>
<?php
}
?>