i am trying to implement simple ajax polling mechanism

Hi,

I do have an xml file in my application and i would like to implement a simple ajax polling mechanism but i am failing to do this .My showdata function below is fine and it accesses to xml and displays the data i need to display

but i want this function to be called every 30 seconds and if an update occured on the file i would like to display it on my page.

i am trying to follow a blog here: http://techoctave.com/c7/posts/60-simple-long-polling-example-with-javascript-and-jquery but although i try their code to poll in every 30 sec ,i cant seem to get this right. could you help me?

(function () {
    $.ajax({
        url: "http://localhost:21301/", success: function (data) {
            //Update your dashboard gauge
            console.log('inside the function');
            showData();
        }, dataType: "json"
    });
}, 30000);


     var showData=(function () {
            $.ajax({
                type: "GET",
                url: "Data.xml",
                dataType: "xml",
                success: function (xml) {
                    var test = $(xml).find('k').text();
                    $('#result span').html(test);
                }
            });
        });

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