score:0

Accepted answer

you can use css class and add to item.

 $(chart.series).each(function (i, serie) {
                    $('<li style="color: ' + serie.color + '">' + serie.name + '</li>').click(function () {
                        if(serie.visible) {
                            $(this).addclass('inactive');
                            serie.hide();
                        } else { $(this).removeclass('inactive');
                            serie.show();
                        }

                    }).appendto('#legend');
                });

http://jsfiddle.net/j3xvg/16/


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