Newbie - Popups?

[Jim Mitchell]

I would like to have an image button to help a user find Accounts in my
database. In traditional ASP, I was using the ShowModalDialog, sending a
request to the server and then dynmically repainting the screen with html
tags.

Is there a recommended way to get the same kind of GUI on a .NET page? I
guess I am going to have the Lookup button and textbox hidden until the user
clicks the Find image button, but it seems like there might be a better way.

Thanks in advance.

Jim