Flot.pie - Tooltip on pie chart - https://github.com/krzysu/flot.tooltip/issues/26#issuecomment-22946188

gistfile1.js

$(document).on("mouseenter", ".plot .label",
        function (event) {
            $(this).animate({ opacity: 0 },
                function () {
                    $(this).addClass('hidden-label');
                }
            ).delay(5000).animate({ opacity: 0.85 },
                function () {
                    $(this).removeClass('hidden-label');
                }
            )
        }
    );

.hidden-label { 
    display: none; 
}