function swapImage(doc, imgName, imgUrl, imgText) {
        if(imgText!="") { window.status = imgText; }
	if(doc.images) {
		doc.images [imgName].srcORG = doc.images [imgName].src;
		doc.images [imgName].src = imgUrl;
	}
}

function swapImageRestore(doc, imgName) {
	window.status = '';
	if(doc.images) {
		doc.images[imgName].src = doc.images[imgName].srcORG;
	}
}