function login(){
	global $con, $username, $errors;

	$username = e($_POST['username']);
	$password = e($_POST['password']);

	// make sure form is filled properly
	if (empty($username)) {
		array_push($errors, "Username is required");
	}
	if (empty($password)) {
		array_push($errors, "Password is required");
	}

	// attempt login if no errors on form
	if (count($errors) == 0) {
		$password = md5($password);

		$query = "SELECT fss_OnlineRegister.custid, custemail, password, fss_Customer.user_type FROM fss_OnlineRegister, fss_Customer WHERE custemail='$username' AND password='$password' LIMIT 1";
		$results = mysqli_query($con, $query);

		if (mysqli_num_rows($results) == 1) { // user found
			// check if user is admin or user
            $rows = mysqli_fetch_array($results);

			$logged_in_user = mysqli_fetch_assoc($results);
			if ($rows["user_type"] == "1") {

				$_SESSION['user'] = $rows["custemail"];
                $_SESSION['custid'] = $rows["custid"];
				$_SESSION['success']  = "You are now logged in";
				header('location: admin/index.php');
			}else{
				$_SESSION['user'] = $rows["custemail"];
                $_SESSION['custid'] = $rows["custid"];
				$_SESSION['success']  = "You are now logged in";

				header('location: index.php');
			}
		}else {
			array_push($errors, "Wrong username/password combination");
		}
	}
}