Select in combox and display data in textbox

Hi.... i need you HELP!!!!

i need next .....
select code from ajax popup and move this data for other field in to textbox .... for example:
add new field:

newCode : Link(here come to ajax popup)

newData1:

newData2:
Popup AJAX (here select code....)

CODE Data1 Data2

001 AAAAA AABBB

002 BBBBB BBCCC

003 CCCCC CCDDD
later
newCode : 001

newData1: AAAAA

newData2: AABBB
save.....
tkx!