title: Add or minus a variable value on button click?
body: <p>I'm very new to javascript so please forgive me this if it's actually a crazy simple thing to do, but I've been googling and going through all my reference sites with no luck.  What I'm trying to do is display a variable's value and change the value the variable either +1 or -1 when the user clicks the appropriate button - <a href="http://i.stack.imgur.com/RaFz9.png" rel="nofollow">like this</a>.</p>
  
  <p>Can anyone help me? Thanks!</p>