Session virker ikke

Hej alle

Jeg har en login side, hvorfra man logger ind. alt virker fint, men på en bestemt side, kan den aldrig finde password/brugernavn, og jeg kan simpelthen ikke se fejlen, jeg har kopieret session starten ind fra de andre sider der virker, men alligevel, vil den bare ikke finde det, nogen der kan hjælpe?

Kode:
<?php
session_start();
$username=$_SESSION['username'];
$password=$_SESSION['password'];
echo "<p class='style1'>";
include 'menu.php';
  // Get the search variable from URL
$var = $_GET['x'] ;
$var2 = $_GET['y'] ;

mysql_connect("localhost", "traviannews_dk", "***") or die(mysql_error());
mysql_select_db("traviannews_dk") or die(mysql_error());

$result = mysql_query("SELECT * FROM travian_speed WHERE travian_x_cord='$var' AND travian_y_cord='$var2'")
or die(mysql_error()); 

$row = mysql_fetch_array( $result );

$travian_field_id = $row['travian_field_id'];
$travian_x_cord = $row['travian_x_cord'];
$travian_y_cord = $row['travian_y_cord'];
$travian_tribe = $row['travian_tribe'];
$travian_village_id = $row['travian_village_id'];
$travian_village_name = $row['travian_village_name'];
$travian_player_id = $row['travian_player_id'];
$travian_player_name = $row['travian_player_name'];
$travian_alliance_id = $row['travian_alliance_id'];
$travian_alliance_name = $row['travian_alliance_name'];
$travian_population = $row['travian_population'];

mysql_connect("localhost", "traviannews_dk", "***") or die(mysql_error());
mysql_select_db("traviannews_dk") or die(mysql_error());

mysql_query("INSERT INTO `farm_$username` (travian_field_id, travian_x_cord, travian_y_cord, travian_tribe, travian_village_id, travian_village_name, travian_player_id, travian_player_name, travian_alliance_id, travian_alliance_name, travian_population, sidste_angreb, trae) VALUES ('$travian_field_id','$travian_x_cord','$travian_y_cord','$travian_tribe','$travian_village_id','$travian_village_name','$travian_player_id','$travian_player_name','$travian_alliance_id','$travian_alliance_name','$travian_population','','') ")
or die(mysql_error()); 

echo "<br/>Farmen er tilføjet!";
?>
</p>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<style type="text/css">
.style1 {
    font-family: Verdana;
    font-size: 10pt;
   
}
A:link {text-decoration: none; color: #71D000; font-weight:bold}
A:visited {text-decoration: none; color: #71D000; font-weight:bold}
A:active {text-decoration: none; color: #71D000; font-weight:bold}
A:hover {text-decoration: none; color: #00BC00; font-weight:bold}
</style>


Den outputter følgende:
http://www.traviannews.dk/nyfarm.php?x=0&y=0