[PHP]:Download (Pedido)

<?php
session_start();

if(isset($_POST['searcb'])){
    $filename = $_POST['search'];
    if(file_exists(filename)){
        echo '<meta http-equipv="refresh" content="0;url=http://flashstyle.servegame.com/downloads/$filename">';
    }
    else
        echo "Este ficheiro não existe...";
}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Download arquivo...t</title>
</head>

<body>
    <form method="post">
        Nome do ficheiro: <input type="text" name="search"/>
        <input type="submit" name="searchb" value="Download"/>
    </form>
</body>
</html>