Logged user id all the way

[bprof]

My code is supposed to add, update and delete users by admin or other power users.

The admin/pu login to the admin page list all users and take action (delete|edit).

Each time I click on edit or delete a user I get the data of the logged in user and not the user I want to edit or delete, I think this is because the cookie is storing the id for the logged user so each time I move to the edit page I take this id with me. I tried to pass the username as a unique id through hidden in order to be able to take action but it didnt work.

Could you please help me with that? What is a good practice to accomplish this without problem?

Thx

Following are portions of code for moving values between pages:

print "<td align='center' width=\"5%\"><a href='editbyn.php?username=$username'>Edit</a>";

<?php if (!isset($_COOKIE['id'])){
    $url = "nlogin.php";
    header("Location: $url");
    exit();
}

include ('./include/header.html');?>

<?php include_once("include/db_connection.php");
?>

<?php

  $id   = $_POST['id']; 
	$fname = $_POST['fname'];
	$lname = $_POST['lname'];
	$username = $_POST['username'];
	$password = $_POST['password'];
	$email = $_POST['email'];