//set cookies
$("#div").toggle(function() { //create div toggle
	$("#div").slideUp("slow"); //create effect
	$.cookie('cookie_name', 'value', {expires: 7}); //set cookie expire in 7 days
}, 
function () { //continue the toggle
	$("#div").slideDown("slow"); //create effect
	$.cookie('cookie_name', 'value'); //set cookie
});

//get cookie
alert( $.cookie("cookie_name") );

//check for cookies
	var cookie_name = $.cookie('cookie_name'); //set cookie var
	if (cookie_name == 'value') { //if equals this val
		$("#div").hide(); //do this
	};

//check for null cookies
var cookie_name = $.cookie('cookie_name'); //set cookie var
	if (cookie_name == null) { // if empty
		$("#div").hide(); //do this
	};

//null cookies, same as getting
$.cookie("cookie_name", null);

http://www.vagrantradio.com/2009/10/getting-and-setting-cookies-with-jquery.html

How to set, get, check for and remove cookies with jQuery.

Set, Get, Check and Null Cookies with Jquery

jQuery