title: Check if connected to a network; jQuery
body: <p>I have searched through StackOverflow and have seen various topics on how to do this, but nothing that really pertains to my particular situation. I am writing (for a class) a mobile "application" (using HTML5, CSS, jQuery). It will end up being a stand alone "app", something that will contain a local copy of all the needed files. On one of my pages I have a submit form, and since the user can't submit the form if they are offline, I would like the page to be redirected to a custom 404 page. </p>
  
  <p>I was just searching to see if there was a way to accomplish this in jQuery, as I haven't really found anything yet. </p>
  
  <p>Thanks</p>