Help on my login

<?php
session_start(); 
include "inc/db_connect.php";
echo "<title>OnlineGamerBase</title>";
echo "<link rel='stylesheet' href='stylesheet.css' type='text/css'/>";
echo "<center>";
 
if($logged[id]) {
print "$logged[username], you are being redirected...";
echo "<meta http-equiv='Refresh' content='2; URL=index2.php'/>";
}else
if(isset($_GET['login'])) {
if((!$_POST[username]) || (!$_POST[password])) {
print "ERROR: A feild was left blank please go <a href='index.php'>back</a> and try again.";
}
}else
if(isset($_GET['login'])) {
$username= htmlspecialchars(addslashes($_POST[username])); 
$password = sha1(md5(md5(sha1(md5(sha1(sha1(md5($_POST[password]))))))));
$uinfo = mysql_query("SELECT * FROM `members` WHERE `username` = '$username'") or die(mysql_error()); 
$checkuser = mysql_num_rows($uinfo);
if($checkuser == '0')
{
print "Username not found"; ;
}else{
$udata = mysql_fetch_array($uinfo);
if($udata[active] == 0) { 
print "Error: This account has not been verified, go <a href='index.php'>back</a>.";
}
else
if($udata[password] == $password) {
$query = mysql_query("SELECT * FROM `users` WHERE `username` = '$username'") or die(mysql_error()); 
$user = mysql_fetch_array($query);
$_SESSION['id'] = "$user[id]";
$_SESSION['password'] = "$user[password]";
 
print "You are now logged in, Please wait. . .";
echo "<meta http-equiv='Refresh' content='2; URL=index2.php'/>";
}
 
else{
print "ERROR: Incorrect username or password! Go <a href='index.php'>back</a>."; 
}
}
}else{
echo "  
  <br>
  <br>
  <u>Login</u>
 
 
  <form action='index.php?login' method='post'>
  Username:
  <input name='username' type='text' maxlength='15' />
 
 
  Password:
  <input name='password' type='password' maxlength='15' />
 
 
  <input name='submit' type='submit' value='Submit' />
  </form>
  <br>";
}
echo "<center>";
?>