var imgFauna2a = new Image(252,144);
var imgFauna2b = new Image(252,144);
var imgFauna2c = new Image(252,144);

imgFauna2a.src = "Fauna2a.jpg"
imgFauna2b.src = "Fauna2b.jpg"
imgFauna2c.src = "Fauna2c.jpg"

function show(imgPainting){
  //copy the value to the display image
  document.imgFauna.src = imgPainting.src;
}