PHP - Problema con tildes

$sqlWebsite = "SELECT * FROM website";

$resultWebsite = mysqli_query($conectar, $sqlWebsite);

mysqli_query ($conectar, "SET NAMES 'utf8'");

if($row = mysqli_fetch_array($resultWebsite)){

	$coreWebHeader = $row["Header"];

	$coreWebHeaderText = $row["HeaderText"];

	$coreWebHeaderBackground = $row["HeaderBackground"];

}

<?php

    /*Va al top del documento, incluso antes que el HTML*/

    header('Content-Type: text/html; charset=UTF-8');

?>

<?php

$con=mysqli_connect("localhost","tu_usuario","tu_password","tu_db");

// Checkeamos la conexion

if (mysqli_connect_errno())

  {

  echo "Error al conectar con MySQL: " . mysqli_connect_error();

  }

// Cambiamos el charset a utf8

mysqli_set_charset($con,"utf8");

mysqli_close($con);

?>