[Barron]

try this:

assumes:
<form method=POST action=info.php>

EDIT: Shit, I read your question wrong. The below script was changed to get the info you want.

<?
session_start();
$con=mysql_pconnect("localhost", "db_username", "db_password");
if($_POST[firstname] and $_POST[lastname])
{
foreach($HTTP_POST_VARS as $key=>$value)
{
$_POST[$key]=trim($value);
}
$info=mysql_query("SELECT * FROM `members` WHERE `firstname`='$_POST[firstname]' AND `lastname`='$_POST[lastname]' LIMIT 1", $con) or die(mysql_error());
$info_numrows=mysql_num_rows($info);
if($info_numrows > 0)
{
// found info
$info_array=mysql_fetch_array($info);
$_SESSION[firstname]=$_POST[firstname];
$_SESSION[lastname]=$_POST[lastname];
echo "First name: $info_array[firstname]<br>\n";
echo "Last Name: $info_array[lastname]<br>\n";
echo "Address: $info_array[address]<br>\n";
}
else
{
// info not found
echo "you are not in our database<br>\n";
include('get_info.php');
}
}
else
{
// No first or last name provided
include(get_info.php);
}
?>