Login y Logout!

[samyb8]

Si está.
Este es el Login completo:

<?php
session_start();
if(isset($_GET['reg'])){
$reg=$_GET['reg'];
}else{
$reg="";
}
if($reg==1){
$msg1="<font color=\"#FF0000\"><b>Your details have been added, please login</b></font>";
}elseif($reg==2){
$msg1="<font color=\"#FF0000\"><b>You have been successfully logged out.</b></font>";
}

if(isset($_POST['submit'])){
if( empty($_POST['uname']) && (empty($_POST['upass']))){
header( "Location:Messages.php?msg=1" );
exit();
}
//transfer to shorter var
$n=$_POST['uname'];
$p=$_POST['upass'];

//connect to db
include('config.php');
$query="select * from usuarios where usuario='$n' and password='$p' ";
$result=mysql_query($query);

$num=mysql_num_rows($result);
if($num>0 ){

//put in session vars

$mytime=time();
$mytime=date("H:i:s A",$mytime);
$_SESSION['time'] = $mytime;
$_SESSION['status'] = 'logged';
$_SESSION['username'] = $n;
//goto next page
header("location:welcome.php");
exit;
}else{
$_SESSION['status'] = 'not logged';

header( "Location:Messages.php?msg=2" );
exit();

}
}
?>

Puede ser alguna variable cambiada de nombre?