public function unsetCookie()
{
// Check if HttpCookieObject exists
$this->getHttpCookieObject();
$name = $this->httpCookieObject->getName();
$expire = $this->httpCookieObject->getExpiryTime();
$path = $this->httpCookieObject->getPath();
$domain = $this->httpCookieObject->getDomain();
$secure = $this->httpCookieObject->isSecure();
$value = null;
$httpCookieObject = new Zend_Http_Cookie($name, $value, $domain, $expire, $path, $secure);
$this->setHttpCookieObject($httpCookieObject);
return $this->write();
}