// Button Rollover Code
function rollOver(imgID, imgName) {
  if (navigator.appName== "Netscape" && parseInt(navigator.appVersion) >= 3)
    document.images[imgID].src = imgName;
  else if (navigator.appName != "Netscape" && parseInt(navigator.appVersion) >= 4) 
    document.images[imgID].src = imgName;

  if (document.getElementById('ns_' + imgID).className == 'displayNone') {
    document.getElementById('ns_' + imgID).className = 'displayBlock';
  } else {
    document.getElementById('ns_' + imgID).className = 'displayNone';
  }
}