var ToggleVisible = new Action('ToggleVisible');
ToggleVisible.start = function(parent,arguments) {
  var target = parent.id;
  if (arguments) target = arguments[0];
  if (document.getElementById(target)) document.getElementById(target).style.display = '';
}
ToggleVisible.flip = function(parent,arguments) {
  var target = parent.id;
  if (arguments) target = arguments[0];
  if (document.getElementById(target)) document.getElementById(target).style.display = 'none';
}


var SwapImage = new Action('SwapImage');
SwapImage.start = function(parent,arguments) {
  var previewImg = arguments[0];
  var newImg     = arguments[1];
  var newAlt     = arguments[2];
  
  var target = document.getElementById(previewImg);
  target.src = newImg;
  target.alt = newAlt;
}

var test = new Action('test');
test.start = function(parent,arguments) {
  alert(parent.id);
}