what are the “for” and “event” attributes of the script tag (Javascript,HTML)

Question

In a web application I\'ve inherited at work which was written about 10 years ago I\'ve noticed the following code snippets repeatedly used:

Answer 1

I have seen this kind of code snippet in a classic ASP project, where it uses a simple vbscript form validation method. `

This onclick event will call the Menu_Validate() method and do form validation.