Idit Yaaron, the spokeswoman for the Tel Aviv Stock Exchange, told CNN that the main site of the stock exchange where the trading takes place was not harmed and operates on a very high level of Internet security.

CNN: Hackers attack two Israeli websites

In Microsoft Internet Explorer 5 select Tools, Internet Options, choose the Security tab, and then click the Custom Level button and scroll down to Cookies to locate the settings.

CNN: Guard your online privacy