problem in pick the data on popup window

[lapunluyang]

I have a form with several fields. At the press of a button, I would like a popup list to appear. Users can select from the list. On pressing the Return key, the fields will automatically be populated with data of the selected item and insert into the form field..
how to do that..can someone show me the coding?

[DPS Computing]

Do you mean, like a drop down box?