Stuff

if(isset($_POST['btnSign'])) 
{ 
    $name    = trim($_POST['txtName']); 
    $email   = trim($_POST['txtEmail']); 
    $url     = trim($_POST['txtUrl']); 
    $message = trim($_POST['mtxMessage']); 
     

    if(!get_magic_quotes_gpc()) 
    { 
        $name    = addslashes($name); 
        $message = addslashes($message); 
    } 
     
    if ($url == 'http://') 
    { 
        $url = ''; 
    } 
    
    $query = "INSERT INTO guestbook (name, email, url, message, entry_date) " . 
             "VALUES ('$name', '$email', '$url', '$message', current_date)"; 

    mysql_query($query) or die('Error, query failed. ' . mysql_error()); 
    header('Location: ' . $_SERVER['REQUEST_URI']); 
    exit; 
}