According to the new EU e-Privacy Directive you have to get your visitors informed consent before placing a cookie on their machine.
WP Cookies Alert
WP Cookies Alert WordPress plugin lets you add an alert box at the top or bottom of the page that notifies your blog visitors about the blog uses cookies to provide its visitors the best experience on the website. You can display a short message or publish a link to a page with extended explanation. WP Cookies Alert is multilingual and can be translated to multiple languages. English and spanish are included.
You can easily customize the message I mean the alert box easily. Here the plugin settings page below see what are the things that you can customize within the alert box:
Go to Settings → WP Cookies Alert
