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<?php
$user = 'name des users';
$password = 'das passwort halt';
if($_POST['form1'] == $user && $_POST['form2'] == $password)
{
  include('geschuetzte_seite.php');
}
else
{
?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<input type="text" name="form1">
<input type="password" name="form2">
<input type="submit" value="login">
</form>
<?php
}
?>

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<form action="" name="formular" onsubmit="CreateAction(this)" 	method="post" encType="text/plain">   
   Empfänger:<input type="text" name="empfaenger"><br>
   Betreff:<input type="text" name="betreff"><br>
   Nachricht:<input type="text" name="message"><br>
<input type="submit"> 
</form>
<script type="text/javascript">
function CreateAction(MyEmailForm)
{
  if (window.document.formular.empfaenger.value == '' || window.document.formular.betreff.value == '' || window.document.formular.message.value == '')
  {
    alert("Bitte alle Felder ausfuellen!");
    return false;
  }
  else
  {
    MyEmailForm.action = "mailto:" + MyEmailForm.empfaenger.value + "?subject=" +  MyEmailForm.betreff.value + "&body=" + MyEmailForm.message.value;
    return true;
  }
}
</script>