var imgFauna1a = new Image(252,144);
var imgFauna1b = new Image(252,144);
var imgFauna1c = new Image(252,144);

imgFauna1a.src = "Fauna1a.jpg"
imgFauna1b.src = "Fauna1b.jpg"
imgFauna1c.src = "Fauna1c.jpg"

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