title: Leverage browser caching
body: <p>According to: <a href="http://code.google.com/speed/page-speed/docs/caching.html#LeverageBrowserCaching" rel="noreferrer">http://code.google.com/speed/page-speed/docs/caching.html#LeverageBrowserCaching</a> I should be using browser caching.  However, I don't know how.</p>
  
  <p>Do I simply add certain tags into the html  section?  Or is thing something I need to send via to server to the client? something to do with php headers?</p>