function get_option_storage(option_name) {
    var result = false;

    chrome.storage.sync.get( option_name, function(func_result) {
        result = func_result;
    });

    return result;
}

function set_option_storage(option_name, option_value) {
    var result = false;

    chrome.storage.sync.set( {option_name: option_value}, function() {
        result = true;
    });

    return result;
}