title: jQuery see if any or no checkboxes are selected
body: <p>I know how to see if an individual checkbox is selected or not.</p>
  
  <p>But Im having trouble with the following - given a form id I need to see if <em>any</em> of the checkboxes are selected (i.e 1 or more), and I need to see if <em>none</em> are selected.  Basically I need two separate functions that answer these two questions.  Help would be appreciated.  Thanks!</p>
  
  <p>Actually, I would just need a function to tell me if <em>none</em> are selected.  Knowing this would answer the other question.</p>