Your browser is unable to interpret the JavaScript statements used in the
construction of these vocabulary exercises. Perhaps it has only a limited
command of the JavaScript language, or perhaps it is without JavaScript
capability entirely. More likely, however, your browser's JavaScript
capability has been disabled.
If the JavaScript capability of your browser has merely been disabled,
you can easily enable it. For example, if you are using Netscape Navigator 3.x,
choose "Options," then "Network Preferences," then "Languages," and finally
"Enable JavaScript." To enable the Javascript capability of other browsers,
you will need to follow somewhat different (but equally simple) procedures.