Multiple Textboxes, but only one editable at a time

I'm looking for some ideas on how to accomplish this ...

I need to create a form with multiple textboxes, but only 1 textbox can be enabled at a time. The form also needs to be printer-friendly.

I was hoping that I could provide functionality that allows the user to double click on a disabled textbox to enable it and at the same time disbale the textbox they were just working on.

My goal with the double click is that there are no other objects to hide for printing.

Any ideas or other suggestions on meeting these requirements? Code examples would be extremely appreciated.

Thanks.
CD31