title: check if window is open and opens a new window only for once?
body: <p>i use the code below to open a new window when a user drops by my site using jquery document ready function.</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  
  $(document).ready(function(){
    window.open('link','title','width=460,height=500,status=no,scrollbars=yes,toolbar=0,menubar=no,resizable=yes,top=460,left=600'); 
  return false
  });
  
  &lt;/script&gt;
  </code></pre>
  
  <p>However , it keeps on popping out on every single page that have this code.
  What i want to do is only pop out this window ONCE for users that do not have this window opened.
  If a user have this window opened and it will no longer pop out a new one.</p>
  
  <p>So how can i do this??</p>