Cookie is not working properly

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I have a problem with cookie.When using this i have got an error like this\[code\]TypeError: $.cookie is not a function [Break On This Error] $('#' + $.cookie("activediv")).parent().parent().addClass('menuHeaderActive');\[/code\]javascript file is\[code\]$(document).ready(function () { var checkCookie = $.cookie("activediv"); ///$('#' + $.cookie("activediv")).parent().parent().addClass('menuHeaderActive'); alert("a"); });\[/code\]I have the plug in for this cookie.How can I solve this problem?