function act(imgName) {
  if (document.images) 
    document.images[imgName].src = eval(imgName + "a.src");
}

function inact(imgName) {
  if (document.images)
    document.images[imgName].src = eval(imgName + "n.src");
}

function swapImage(name, newSrc) {

    var theImage = false;
    if (document.images) {
        theImage = document.images[name];
    }

    if (theImage) {
        theImage.src = newSrc;
	}
}