if (document.images) {
 imgmuon = new Image();
 imgmuon.src = "cut2over/pic0005.gif";
 imgmpon = new Image();
 imgmpon.src = "cut2over/pic0006.gif";
 
 imgmuoff = new Image();
 imgmuoff.src = "cut2off/pic0005.gif";
 imgmpoff = new Image();
 imgmpoff.src = "cut2off/pic0006.gif";
}

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

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