title: Popup when a new message arrives
body: <p>I have a fully functioning messaging system on my website.
  I want to evolve this by having a box popup altering members when they have a new message.</p>
  
  <p>It would say something like "You have a new message, would you like to view?".
  You would be able to click Yes or No.</p>
  
  <p>How would I go about doing this?
  Never tried anything like this before!</p>
  
  <p>Thanks</p>
  
  <p>UPDATE. 
  I am very inexperienced using the technologies required here. 
  How would I go about ensuring this works on every page?
  What code would I include?
  This is something I need to improve on as it opens up so many more possibilities!</p>