// fixed duration loading screen

function showLoadingScreen(durationInSeconds) {

    if (!durationInSeconds) {

        durationInSeconds = prompt("Enter the load duration in seconds", 3);

    }

    if (durationInSeconds) {

        options = {

            'duration': durationInSeconds

        };

        navigator.notification.loadingStart(options);

    } else {

        return;

    }

}

// standard no duration loading screen, with min duration

var durationOptions = {

    minDuration: 2

};

navigator.notification.loadingStart(durationOptions);

// do other stuff here... when stuff done, stop loading screen

navigator.notification.loadingStop();