A) To Enable Javascript support in Netscape navigator 4.7X :


Open the Edit --> Preferences --> Advanced section and select the
checkbox  for "Enable Javascript"




B) To Enable Javascript support in Netscape 7.X and Mozilla :

Open the Edit --> Preferences --> Advanced --> Scripts & Plugins
section and select the checkbox for Navigator.



C) To Enable Javascript Support in Internet Expolorer 5.X :

Open the Tools --> Internet Options --> Security Tab. Click on the
Custom Level button at the bottom. In the Security Settings dialog
pop-up box, select the option to enable Active Scripting, Allow Paste
Operations via script and Scripting of Java Applets radio buttons.