Extra functie in login

//Dit moet ergens tussen gezet workden.
if($row['unlockdate'] < date('d-m-Y'))
								{
								error_message('Your account is locked!');
								}

<?php
session_start();
//Battle Quest Gaming System V2.0 Copyright by Robin Peters

if(file_exists('config/config.php'))
{
    include('config/config.php');
}
else
{
    echo 'Can not find config file';
}

include('includes/inc_header.php');


//Check if user is already logged in.
if(isset($_SESSION['user_id'])) 
{
error_message("You are already logged in.");
}
else
{
	
	//Check if form has been submitted.
	if($_SERVER['REQUEST_METHOD'] == 'POST'){
		
		//Convert vars
		$username = $_POST['username'];
		$password = $_POST['password'];
	
			//Check if fields are empty.
			if(empty($username))
			{
			error_message('You did not enter a username, Please return.');
			}
			elseif(empty($password))
			{
			error_message('You did not enter a password, Please return');
			}
				
				//Next.
				elseif(!get_magic_quotes_gpc()) 
				{
            	$username = addslashes($username);
            	$password = addslashes($password);
            	}
					
					//Addslashes to username/password
					$password = addslashes(sha1($password));
        			$username = addslashes($username);
					
						//SQL string.
						$sql_db = "SELECT id, username, password, active, activationcode, logo FROM members WHERE username = '$username' AND password = '$password'";
						
							//Check for result.
							$res_db = mysql_query($sql_db) or die ('User cannot be found in our database, ' . mysql_error());
							
								if(($row = mysql_fetch_array($res_db)) == 0) 
								{
								error_message('The entered login information is not right, Please try again.');
        						} 
								elseif($row['active'] == '0')
								{
								error_message('Your account is not activated yet, Please activate first.');
								}
								elseif($row['activationcode'] != 'Activated')
								{
								error_message('Your account is not activated yet, Please activate first.');
								}
								

								
									//Start session
									else
									{
									$_SESSION['user_id'] = $row['id'];
									$_SESSION['username'] = stripslashes($row['username']);
									$_SESSION['password'] = stripslashes($row['password']);
									$_SESSION['active'] = $row['active'];
									$_SESSION['logo'] = $row['logo'];	
									}
									
								}
								?>
		  						<script language="Javascript" type="text/javascript">
    	  						location.href='index.php';
          						</script>
								<?php
							}
						include('includes/inc_footer.php');
				?>