/* Nav Image Rollover */

var OnOff=1;
function replaceImage(imageName) {
  var currentpic = document.images[imageName].src;
  var ref = currentpic.substring(0,currentpic.length-5)+OnOff+".gif";
  document.images[imageName].src=ref;
  OnOff++;
  if (OnOff == 2)
        OnOff=0;
  return true;
}