how to show the exact details of username in mainpage after login succes

[Indians]

here if user logged information is correct it should show the main page. in that mainpage right top corner i need to show the username, employee id, employee name. here i can get username correctly. but, i did not get employee id and employee name.
for example : Name - Indian, Username - Indian1990, Emp id - EMP_6504 these all values already stored in database using registration form. now they logged in using Username - Indian1990 and Password - 123456. and then mainpage will open. In that page i need to show EMPLOYEED ID and NAME of the Username - Indian1990. how to fetch the exact details of username in mainpage????

login page php coding :

<?php
    session_start();
    if($_SERVER['REQUEST_METHOD'] == "POST")
    {
    $uname = $_POST['username'];
    $pwd = $_POST['password'];
    $uname = htmlspecialchars($uname);
    $pwd = htmlspecialchars($pwd);

    include("config.php");
    if (!$_POST["username"] || !$_POST["password"]) 
        { 
        echo "You need to provide a username and password."; 
        } 
    $result = mysql_query( "SELECT * FROM emp_register WHERE emp_username = '$uname' AND emp_password = '$pwd'" );
    while($row = mysql_fetch_array($result))
    {
        if($row["emp_username"] == $uname && $row["emp_password"] == $pwd)
        {
        // Login good, create session variables 
         $_SESSION["valid_id"] = $row->id;
         $_SESSION["valid_user"] = $_POST["username"];
         header ('Location: mainpage.php');
        }
        else
        {
         echo "Sorry, could not log you in. Wrong login information.";
        }
    }
    }
?>

mainpage php coding :

before html tag :

<?php
    session_start(); 
    if (!$_SESSION["valid_user"]) 
    { 
    // User not logged in, redirect to login page 
    header("Location: login.php"); 
    }
?>

inside html tag :

<td width="182" rowspan="5" valign="top">
    <?php
        echo "<p class=bluetext>Employee ID : " . $_SESSION["valid_id"]; 
        echo "<p class=bluetext>Username : " . $_SESSION["valid_user"];
        // Display logout link 
        echo "<p class=outtext><a href=\"logout.php\">Logout</a></p>";
    ?>  
</td>

[minitauros]

It's probably this:

You use while($row = mysql_fetch_array($result)) to fetch your data, so you cannot use $_SESSION["valid_id"] = $row->id; (an object) to access the fetched data. You should use $_SESSION["valid_id"] = $row['id']; (an array), since you are working with an array, not an object.