Updating problem?

Hi on my site i have a page which allows users to insert html, a little like there own webpage, however it only updates for me and no other users.
This is the page where the users edit there page:
<textarea cols="50" rows="27" name="space">
<?php
$username="******";
$password="******";
$database="******";

mysql_connect('******',$username,$password);
@mysql_select_db($database) or die("Unable to select database");

$loginname = $_SESSION['loginname'];

$result = mysql_query("SELECT * FROM user_space WHERE loginname='$loginname'") or die(mysql_error());

$row = mysql_fetch_array( $result );

echo $row['space'];
?>
</textarea>

This is the code which updates the page:

<?php
$username="******";
$password="******";
$database="******";

mysql_connect('******',$username,$password);
@mysql_select_db($database) or die("Unable to select database");

$loginname=$_SESSION['loginname'];
$space=$_POST['space'];

$result = mysql_query("UPDATE user_space SET space='$space' WHERE loginname='$loginname'")
or die(mysql_error());

?>


If its needed heres the create table code:

$query="CREATE TABLE user_space(

id INT NOT NULL AUTO_INCREMENT,
loginname VARCHAR(20) NOT NULL,
space TEXT NOT NULL,

PRIMARY KEY(id) )";


And the code which people view each others page:


<?php
$username="*****";
$password="*****";
$database="*****";

mysql_connect('******',$username,$password);
@mysql_select_db($database) or die("Unable to select database");

$loginname = $_GET['member'];
$result = mysql_query("SELECT * FROM user_space WHERE loginname='$loginname'") or die(mysql_error());

$row = mysql_fetch_array( $result );

echo $row['space'];
?>

If anyone has any ideas please help, thanks.

And you are able to see the other member pages? Echo out the query to see if its what you are wanting.