Microsoft Internet Explorer version 5.5 or higher:
1. Click Tools, then Click Internet Options.
2. Click the Security Tab.
3. Click the Custom Level Button.
4. Scroll to the Scripting Section.
5. Check Enable under Active scripting.

Mozilla Firefox version 1.0: 
1. Click Tools, then click Options, then select the Web Features icon.  
2. Check the box for "Enable JavaScript"
3. Click OK.