Popup window once a day!

Hello friends,
I Already have an pop up window running on my website.

<!DOCTYPE html>
<html>
  <head>
    <meta charset=utf-8 />
    <title>ColorBox demo</title>
    <link rel="stylesheet" href="http://www.jacklmoore.com/colorbox/example1/colorbox.css" />
  </head>
  <body>
    <h1>Hello, there!</h1>
    <h2>This is some content</h2>
    <p>The popup will open in five seconds</p>

    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
    <script src="http://www.jacklmoore.com/colorbox/jquery.colorbox.js"></script>
    <script src="jquery.cookie.js"></script>

    <script>
      function openColorBox(){
        $.colorbox({iframe:true, width:"80%", height:"80%", href: "http://www.sitepoint.com"});
      }
      
      if(!$.cookie("colorboxShown")){
        openColorBox();
        $.cookie('colorboxShown', true, { expires: 1, path: '/' });
      }
    </script>
  </body>
</html>

This code is made by @James_Hibbard in This Thread.

I Have copied that code and putted it on my website , but i got complaints by my visitors to remove the popup window as it is loading everytime when the page loads.
Thats why i need an code :-
Popup window will only comes once in 24 hours for EACH VISITOR.
Thanks In advance.