gistfile1.js

function(ssid) {
  var manager = window.navigator.mozWifiManager;
  var req = manager.getNetworks();
  req.onsuccess = function onScanSuccess() {
    var networks = req.result;

    for (var i = 0; i < networks.length; i++) {
      if (networks[i].ssid === ssid) {
        manager.associate(networks[i]);
      }
    }
  }
}