Button and image fade-in

alright i need help on my project agian. i have 5 button adn i need to know how to make it so when button 1 is clicked the 2 pics fade-in and then wehn button 2 is click they fad out and the buton 2 picks fade-in. can anyone help do something like thhis or anything similar.

i need some quick help its due tomorow!!!