[niki-van-stein]

It does not work because you can only store strings in cookies. You store the string "true" instead of the boolean value true.

Try the following code where I replaced the check with != "true".

<script type='text/javascript'>//<![CDATA[
  $(window).load(function(){
  // if no cookie
  if ($.cookie('alert')!="true") {
      $( "#pop-up" ).show();
      $("#hide").click(function() {
          $( "#pop-up" ).slideUp( "slow" );
          // set the cookie for 24 hours
          var date = new Date();
          date.setTime(date.getTime() + 24 * 60 * 60 * 1000); 
          $.cookie('alert', "true", { expires: date });
      });
  }
  });//]]> 
</script>

A working jsfiddle: http://jsfiddle.net/bqam0qb4/1/

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