var forwardParams = Array();
var forwardModule = 0;
var forwardSub = 0;

var backParams = Array();
var backModule = 0;
var backSub = 0;

var navParams;

function navigate_forward() {
  module_id = forwardModule;
  sub_id = forwardSub;
  navParams = forwardParams;
  
  navigateGo();
}

function navigate_back() {
  module_id = backModule;
  sub_id = backSub;
  navParams = backParams;
  
  navigateGo();
}

function navigateGo() {
  switchModule(module_id, sub_id, navParams);
}