<?php

  include 'bd.php';

  $result = mysql_query("SELECT adminpass FROM adminpassword");
  $array = mysql_fetch_array($result);


  if(!empty($_POST['password'])){

    if($_POST['password']==$array[adminpass]){
      session_start();
      $_SESSION['access']=true;
      header("Location: adminpanel");
    }
    else {
       header("Location: error");
    }
  }
  else
  {
    ?>

CONTENT...

<?php
  }
?>