function getObjByName(name,doc) {
if(!doc) doc = document;
if(doc[name]) return doc[name]; 
  for(var i=0;i < doc.layers.length;i++){
  var lyrdoc = doc.layers[i].document;
  if(lyrdoc[name]) return lyrdoc[name]; 
    if(lyrdoc.layers.length > 0) {
    var obj = getObjByName(name, lyrdoc);
    if(obj) return obj;
    }
  }
return 0;
} 

function swapImg() { 
if(!document.images) return;
var args = swapImg.arguments; 
  for(var i = 0; i < args.length; i+=2) {
  var imgSrc = (args[i + 1].indexOf('[') != -1) ? eval(args[i + 1] + '.src') : args[i + 1]; 
  if(getObjByName(args[i])) getObjByName(args[i]).src = "" + imgSrc; 
  }
}