<div id="flot-tooltip" class="flot-tooltip"></div>

}
div.flot-tooltip {
    display: none;
    position: absolute;
    border: 1px solid #fdd;
    padding: 2px;
    background-color: #fee;
    opacity: 0.80;
    z-index: 100;

        $("#" + id + "-chart").bind("plothover", function (event, pos, item) {
            if (item) {
                var i = data[item.dataIndex];
                var date = new Date(i.timestamp * 1000);
                var s =
                    "Build <em>" + i.id + "</em><br/>"
                    + "on " + date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate() + ""
                    + ":<br/><strong>" + i.value
                    + (i.unit != null ? " " + i.unit : "") + "</strong>";
                $("#flot-tooltip")
                    .html(s)
                    .css({top: item.pageY + 10, left: item.pageX + 10})
                    .show();
            } else
                $("#flot-tooltip").hide();
        });