I need to format my pie and column charts to show the $ and comma in currency format ($###,###) when you hover over the charts. Right now, it is displaying the number and percentage but the number as #####.## here is my code. Any help would be appreciated.

// Load the Visualization API and the piechart package.

      google.load('visualization', '1.0', {'packages':['corechart']});



      // Set a callback to run when the Google Visualization API is loaded.

      google.setOnLoadCallback(drawChart);



      var formatter = new google.visualization.NumberFormat({

            prefix: '$'

        });

        formatter.format(data, 1);



        var options = {

            pieSliceText: 'value'

        };



      // Callback that creates and populates a data table,

      // instantiates the pie chart, passes in the data and

      // draws it.

     function drawChart() {



                    // REVENUE CHART - Create the data table.

        var data4 = new google.visualization.DataTable();

        data4.addColumn('string', 'Status');

        data4.addColumn('number', 'In Thousands');

        data4.addRows([

          ['Net tution & Fees', 213.818],

          ['Auxiliaries', 30.577],

          ['Government grants/contracts', 39.436],

          ['Private grants/gifts', 39.436],

          ['Investments', 10.083],

          ['Clinics', 14.353],

          ['Other', 5.337]

        ]);



                    // EXPENSES CHART - Create the data table.

        var data5 = new google.visualization.DataTable();

        data5.addColumn('string', 'Status');

        data5.addColumn('number', 'Amount');

        data5.addRows([

          ['Instruction', 133.868],

          ['Sponsored Progams', 34.940],

          ['Auxiliaries', 30.064],

          ['Academic Support', 25.529],

          ['Depreciation & amortization', 18.548],

          ['Student Services', 22.626],

          ['Plant operations & maintenance', 18.105],

          ['Fundraising', 13.258],

          ['Geneal Administration', 11.628],

          ['Interest', 6.846],

          ['Student Aid', 1.886],

        ]);



                    // ENDOWMENT CHART - Create the data table.

        var data6 = new google.visualization.DataTable();

        data6.addColumn('string', 'Status');

        data6.addColumn('number', 'In Millions');

        data6.addRows([

          ['2010', 178.7],

          ['2011', 211.693],

          ['2012', 199.3]

        ]);



        // Set REVENUE chart options

        var options4 = {

                        is3D: true,

                        fontName: 'Arial',

                        colors:['#AFD8F8', '#F6BD0F', '#8BBA00', '#FF8E46', '#008E8E', '#CCCCCC', '#D64646', '#8E468E'],

                        'title':'',

                       'width':550,

                       'height':250};              

        // Set EXPENSES chart options

        var options5 = {

                        is3D: true,

                        fontName: 'Arial',

                        colors:['#AFD8F8', '#F6BD0F', '#8BBA00', '#FF8E46', '#008E8E', '#CCCCCC', '#D64646', '#8E468E'],

                        'title':'',

                       'width':550,

                       'height':250};

        // Set ENDOWMENT chart options

        var options6 = {

                        is3D: true,

                        fontName: 'Arial',

                        colors:['#AFD8F8', '#F6BD0F', '#8BBA00', '#FF8E46', '#008E8E', '#CCCCCC', '#D64646', '#8E468E'],

                        'title':'',

                       'width':450,

                       'height':250};



        // Instantiate and draw our chart, passing in some options.

        var chart4 = new google.visualization.PieChart(document.getElementById('chart_div4'));

        chart4.draw(data4, options4);

        var chart5 = new google.visualization.PieChart(document.getElementById('chart_div5'));

        chart5.draw(data5, options5);

        var chart6 = new google.visualization.ColumnChart(document.getElementById('chart_div6'));

        chart6.draw(data6, options6);}