How to hide popup for existing customers?

How to hide popup for existing customers? Set cookie pd + PopUp ID with value “true”, for example –¬†pdV1RpTP70e You can find PopUp ID in URL of PopUp you are willing to hide. You can find instructions on how to set cookie in PHP on http://php.net/manual/en/function.setcookie.php And in JS on http://www.w3schools.com/js/js_cookies.asp  

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