A computing system including a script module to perform a run-time extension to modify the functionality of a corresponding World Wide Web (WWW) application object is described. The script module modifies the functionality of the corresponding WWW application object without modifying the functionality of other WWW application objects of the same class. The computing system further includes an input device for inputting a script for the script module. The script is coupled to the corresponding WWW application object when the corresponding WWW application object is instantiated.