Can't Checkout, pages update and nothing happen

When i go to checkout, pages update but nothing happen.

That was the response of the attendant, when I reported the case:

"We are very sorry for the trouble this has caused you. Currently, we are unaware of any technical problems that might affect the availability of our Web site. Before you try to access your account again, please check your Web browser's settings to make sure that cookies, Java Applications and JavaScript are enabled on your computer. With these features enabled from your Web browser, you should have no problem accessing Walmart.com. If you need further assistance on any of these instructions, please contact your Internet Service Provider."