// http://www.dansteinman.com/dynduo/

function swapImage(layerName, imgName, objName) { 
	if ((document.layers) && (layerName != null)) {
		eval('document.' + layerName + '.document.images["' + imgName + '"].src = ' + objName + '.src');
	} else {
		document.images[imgName].src = eval(objName + ".src");
	}
}