function swapImage(imgName,swapSrc) {

	if (document.images[imgName]) {

		eval("document." + imgName + ".src = \"" + swapSrc + "\"");

	} else { // try referenceing image on a layer

		numLayers = document.layers.length;

		for (x=0;x<numLayers;x++) {

			thisImg = document.layers[x].document.images[imgName];

			if (thisImg) thisImg.src = swapSrc;

		}

	}

}