How to add a popup message-box to receive user input in widget?

[yaohua xiao]

Hi, everyone!
How can I make a popup messagebox in ofbiz widget, so the user click on a
button or hyperlink the messagebox shows up, and after input somethings, the
messagebox hided again?
It can be done by some ajax code, but in ofbiz, how can I do that?
Any suggestion will be appreciated.