<form method="post" action="http://www.your-domain.com/squirrelmail/src/redirect.php">
<input type="hidden" name="js_autodetect_results" value="0">
User: <input type="text" name="login_username" size="10">
Password: <input type="password" name="secretkey" size="10">
<input type="submit" value="Login">
</form>