I guess I agree with the consensus so far...

I use JavaScript in some of my forms to validate data, because nobody likes to click the Submit button and wait for 5-10 seconds only to find out that they missed a required field or mistyped an entry, and then have to go back to the form page and fill it in again (or else my CGI script has to re-display it), and so on ...

But of course you still have to validate the parameters in your CGI script. The JavaScript validation is only for the convenience of the users, not for mine.

buckaduck