Another question bout editing pictures [.please.help.]?

Question: Another question bout editing pictures [!.please!.help!.]!?

okayy now im jus wondering how to change a picture to black n white n then a section that has rainbow colors

for example like this picture=
http://i162!.photobucket!.com/albums/t263/!.!.!.Www@QuestionHome@Com

Best Answer - Chosen by Asker:

use the magic wand tool and select then fillWww@QuestionHome@Com

you do this in two separate layersWww@QuestionHome@Com