cookies using javascript and url redirecting in asp.net page

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Javascript

cookie

my page is not working with cookies using javascript and url redirecting

if userid/username(cookies) already in my browser, it comes thank for vote,otherwise it goes to login page..what is the problem in below code

<script type="text/javascript">

var userid = document.cookie;
var username = document.cookie;

if (userid != null && username != null)
{
$('.review-footer-new').find('.review-feedbackLink').click(function () {

if ($(this).closest("a").is("[disabled]")) {
return false;
}

$(this).addClass("selected");
$(this).parent().after(" Thanks for your vote! ");
$(this)
.closest(".review-feedbackQuestion")
.find(".review-feedbackLink")
.closest("a")
.attr("disabled", "disabled");
});
}
else
{
window.location = "http://localhost/login.aspx";
}
</script>