title: Integrating Google hangouts in Google Sites
body: <p>is it possible to embed a javascript (or any widget) in a Google Sites page? 
  What I need is a simple button that opens a new hangout, for example with a predefined email address. 
  Example, when a user clicks on that button, he is automatically put in a HO that calls my email address.</p>
  
  <p>I know that google Sites has many html/javascript constraints and I would like to know if / how can it be done. </p>