Reading Horizons uses JavaScript in order to be more dynamic, and to add functionality. If JavaScript is disabled, much of the functionality of Reading Horizons will be lost.
Most people use browsers which automatically provide built-in JavaScript capability. These browsers include Netscape Navigator 2.0 or higher, Microsoft Internet Explorer 3.0 or higher, and Opera 3.0 or higher. However, JavaScript can be disabled. Some companies disable JavaScript this as a general security policy.