Perhaps I should have gone into a little more depth before showing that code. I agree with you that JS shouldn't be used as a substitute for serverside checking of valid data, but I disagree that JS has no use as a confirmation tool.

I use this code actually primarily when writing in-house, intralan web sites, where javascript enabled browsers are the norm. In this environment, a JS popup box is very practical, I find it ugly to have to present the user with another confirmation page, with buttons for yes/no, or what have you.

Perhaps you know of a better way to present the kind of functionality I'm talking about, and I would gladly like to hear about it. Untill then, I wil stand by my practice of using JS as a confirmation tool.