var validNavigation = false;
 
function endSession() {
  setRS232('check_logout');
}
 
function wireUpEvents() {
  window.onbeforeunload = function(evt) {
      if (!validNavigation) {
         endSession();
      }
  }
 
  $(document).bind('keydown keyup',function(e) {
	e=e||e.which;
    if (e.keyCode === 116){
      validNavigation = true;
    }
  });
 
  $("a").bind("click", function() {
    validNavigation = true;
  });
 
  $("form").bind("submit", function() {
    validNavigation = true;
  });
 
  $("input[type=submit]").bind("click", function() {
    validNavigation = true;
  });
}

$(document).ready(function() {
  wireUpEvents();  
});