Using buttons to load specific image

Hello all
Am hereby attaching a zip file with a fla (CS4) + images + xml included. What I want to do is to load specific images when the buttons are clicked, while by default the movie is loading an xml file, that is if no button is clicked, then the movie displays the xml images, but if for example I click on btn2, it will load img2… however this is the part am stuck on, as the button is not loading any image (tried a code for btn1)…Also I wanted to know how to allow the xml to make a ‘push’ transition instead of the current one…
Any help would be most welcome…:stormtrooper: