I found this very interesting and simple script: cookie-bar, customizable very easily here.
Unfortunately I didn’t manage to save and use that (free) javascript in local. No jquey, no css, a very short code.
The only thing you have to do is personalize the code within you have what you want hide if your visitor refuse your cookies.
The code should be something like the following:
<?php
if ((isset($_COOKIE['cookiebar'])))
{
echo " [whatever you want";
}
else
{
echo "<div class=\"what-you-want\">to see this content accept our cookie policy.</div>";
}
?>