<!-- Begin
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

ns3up = (browserName == "Netscape" && browserVer >= 3);
ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);

if (ns3up || ie4up) {
  image1 = new Image();
  image1.src = "images/mdhammeredvortex.jpg";
  image2 = new Image();
  image2.src = "images/mdbanchoff.jpg";
  image3 = new Image();
  image3.src = "images/mdphoenixlanding.jpg";
  image4 = new Image();
  image4.src = "images/mdquaterniondissection.jpg";
}

function switchpic(img_name,img_src) {
if (ns3up || ie4up) {
		  document[img_name].src=img_src;
}
}

linkpage = "Large_1.html";  
function clickImage() {
if (ns3up || ie4up) {  
        document.forms['imagelink'].action = linkpage;  
        document.forms['imagelink'].submit();  
        return false;  
}  
}

// End -->