DELETE from table in PHP - Help plzzz

I have been trying to create a functionality which allows users to delete multiple entries from database, I have been working on this for a while now but cant get my head around it, can u please tell me what im doing wrong here?

thanks in advan

[php]<?php

include ‘global.php’;

$session_username = $_SESSION[‘username’];

if ($_POST[‘login’])
{
//get form data
$username = addslashes(strip_tags($_POST[‘username’]));
$password = addslashes(strip_tags($_POST[‘password’]));

if (!$username||!$password)
echo “Enter a username and password”;
else
{
//log in
$login = mysql_query(“SELECT * FROM agents WHERE username=’$username’”);
if (mysql_num_rows($login)==0)
echo “No such user”;
else
{
while ($login_row = mysql_fetch_assoc($login))
{

   //get database password
   $password_db = $login_row['password'];

   //encrypt form password
   $password = md5($password);
   
   //check password
   if ($password!=$password_db)
      echo "Incorrect password";
   else
   {
      //check if active
      $active = $login_row['active'];
      $email = $login_row['email'];
      
      if ($active==0)
         echo "You haven't activated your account, please check your email ($email)";
      else
    {
           $_SESSION['username']=$username;     //assign session
        
     header('Location:my.php');  
      }
   }


  }
}

}
}
else
{

if (isset($session_username))
{
echo “You are logged in, $session_username. , Log out”;
}
else
{
echo "

Username:


Password:


"; }

}

?>[/php]

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