var imgTulip3a = new Image(252,144);
var imgTulip3b = new Image(252,144);
var imgTulip3c = new Image(252,144);

imgTulip3a.src = "Tulip3a.jpg"
imgTulip3b.src = "Tulip3b.jpg"
imgTulip3c.src = "Tulip3c.jpg"

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