function initialize(){
    hideLoadingImage();
    updateChart();
}

function updateChart()
{
    displayLoadingImage();
    
    //
    //we encode the values of all form elements as query parameters
    //
    var elements = document.generalForm.elements;
    url =document.generalForm.elements.action.value + "?";
    for (var i = 0; i < elements.length; ++i)
        {
            var e = elements[i];        
            url = url + e.name + "=" + escape(e.value);
            if (i<(elements.length-1)){
                url = url + "&";
            }
        }
        
        //Now we update the URL of the image to update the chart
        // document.write(url);
        getChart(url);
    }