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>Thanks much. Could you please explain me, how can I setup this nice error page?
>

If you're using IIS:
- go to the Internet Services Manager, right-click your web site and select "Properties"
- Select the "Custom Errors" tab and replace the default html error pages with your own.

If you're not then I can't help you :)

>Also please check my new thread in ASP. I'm having troubles with Popup windows. I want to be able to click on the link and open a new window with details. What should I do to do it?

I'll check that thread. (UPDATE: I see that you got it working)