browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);

ns3up = (browserName == "Netscape" && browserVer >= 3);
ie4up = (browserName.indexOf("Microsoft") >= 0 && browserVer >= 4);

function doPic(imgName) { // Change Picture
if (ns3up || ie4up) {
imgOn = ("../" + imgName);
document.LargePic.src = imgOn;
   }
}

// Detect Browser for Layer Changes

ns4 = (document.layers) ? true:false 
ie4 = (document.all) ? true:false 
ng5 = (document.getElementById) ? true:false 

// To HIDE EACH & ALL Layers

function hideItem() { 
if (ng5) document.getElementById('item1').style.visibility = "hidden" 
else if (ns4) document.item1.visibility = "hide" 
else if (ie4) item1.style.visibility ="hidden" 

if (ng5) document.getElementById('item2').style.visibility = "hidden" 
else if (ns4) document.item2.visibility = "hide" 
else if (ie4) item2.style.visibility ="hidden" 
}

// To SHOW One Layer

function showItem(n) { 
hideItem(); 
if (ng5) document.getElementById('item' + n).style.visibility = "visible"; 
else if (ns4) document.layers["item" + n].visibility = "show"; 
else if (ie4) document.all["item" + n].style.visibility = "visible"; 
}

// To SHOW ALL Layers

function showAllItem(n) { 
if (ng5) document.getElementById('item' + n).style.visibility = "visible"; 
else if (ns4) document.layers["item" + n].visibility = "show"; 
else if (ie4) document.all["item" + n].style.visibility = "visible"; 
}