var imgRetouched = new Image();
var imgOriginal = new Image();

function SetBlinkingTimeout()
{
  setTimeout("blinkRetouchedAndOriginal();", 1200);
}

function startBlinking(retouchedSrc, originalSrc)
{
  imgRetouched.src = retouchedSrc;
  imgOriginal.src = originalSrc;
  SetBlinkingTimeout();
}

function blinkRetouchedAndOriginal() 
{
  var blinkingImage = document.getElementById("blinkingImg");
  blinkingImage.src = (blinkingImage.src == imgRetouched.src) ? imgOriginal.src : imgRetouched.src;
  SetBlinkingTimeout();
}