shadowSize: 0,

        xaxis: {mode: "time", timeformat: "%d/%m/%y"},

        yaxis: {ticks: 3, min: 0, tickDecimals:0},

        grid: {color: "#999"},

        selection: {mode: "x"}

    };

    /**

    *get dummy data needed in few places

    */

    function getDummyData(label){

        return {"label":label,

         "data":[{"time":0,

             "commits":0,

                 "added":0,

                 "changed":0,

                 "removed":0

            }],

            "schema":["commits"],

            "color":'#ffffff'

        }

    }

    /**

     * @param keys

     * @returns

     */

    function generateCheckboxes(data) {

        //append checkboxes

        var i = 0;

        choiceContainerTable.innerHTML = '';

        for(var pos in data) {

            data[pos].color = i;

            i++;

            if(data[pos].label != ''){

                choiceContainerTable.innerHTML +=

                    '<tr><td><input type="checkbox" id="id_user_{0}" name="{0}" checked="checked" /> \

                     <label for="id_user_{0}">{0}</label></td></tr>'.format(data[pos].label);

            }

        }

    }

    /**

     * ToolTip show

     */

    function showTooltip(x, y, contents) {

        var div=document.getElementById('tooltip');