1) Click on "Tools" in the menu and than on "Options"

If "Options" is dimmed you don't have sufficent user rights to change the settings of your browser. Please ask your administrator to activate JavaScript on your browser.

2) Select the "Content" tab

3) Make sure the checkboxes next to "Enable Java" and "Enable JavaScript" are checked.

If the "Default level" button is dimmed, then you are already at the default security level, and JavaScript is enabled.