// Detect if browser is Netscape 3 + or IE 4 +.
bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
    if ((bName == "Netscape" && bVer >= 3) || 
        (bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3"; 
    else br = "n2";

// Create image objects, preload all active and inactive images.
    if (br== "n3") { 
    img1on = new Image();          		
    img1on.src = "images/navigation/roots1.jpg";     	
    img2on = new Image();          		
    img2on.src = "images/navigation/business1.jpg";     	
    img3on = new Image();          		
    img3on.src = "images/navigation/petersfield1.jpg";     	
    img4on = new Image();          		
    img4on.src = "images/navigation/prewar1.jpg";     	
    img5on = new Image();          		
    img5on.src = "images/navigation/war1.jpg";     	
    img6on = new Image();          		
    img6on.src = "images/navigation/louisbourg1.jpg";     	
    img7on = new Image();          		
    img7on.src = "images/navigation/accomplishments1.jpg";     	
    img8on = new Image();          		
    img8on.src = "images/navigation/other1.jpg";     	
    img9on = new Image();          		
    img9on.src = "images/navigation/footnotes1.gif";     	
    img10on = new Image();          		
    img10on.src = "images/navigation/future1.gif";     	
    img11on = new Image();          		
    img11on.src = "images/navigation/familytree1.gif";     	
    img12on = new Image();          		
    img12on.src = "images/navigation/bibliography1.gif";     	
    img13on = new Image();          		
    img13on.src = "images/navigation/studentteacher1.gif";     	
    img14on = new Image();          		
    img14on.src = "images/navigation/partners1.gif";     	
    img15on = new Image();          		
    img15on.src = "images/navigation/team1.gif";     	

    img1off = new Image();          		
    img1off.src = "images/navigation/roots.jpg";     	
    img2off = new Image();          		
    img2off.src = "images/navigation/business.jpg";     	
    img3off = new Image();          		
    img3off.src = "images/navigation/petersfield.jpg";     	
    img4off = new Image();          		
    img4off.src = "images/navigation/prewar.jpg";     	
    img5off = new Image();          		
    img5off.src = "images/navigation/war.jpg";     	
    img6off = new Image();          		
    img6off.src = "images/navigation/louisbourg.jpg";     	
    img7off = new Image();          		
    img7off.src = "images/navigation/accomplishments.jpg";     	
    img8off = new Image();          		
    img8off.src = "images/navigation/other.jpg";     	
    img9off = new Image();          		
    img9off.src = "images/navigation/footnotes.gif";     	
    img10off = new Image();          		
    img10off.src = "images/navigation/future.gif";     	
    img11off = new Image();          		
    img11off.src = "images/navigation/familytree.gif";     	
    img12off = new Image();          		
    img12off.src = "images/navigation/bibliography.gif";     	
    img13off = new Image();          		
    img13off.src = "images/navigation/studentteacher.gif";     	
    img14off = new Image();          		
    img14off.src = "images/navigation/partners.gif";     	
    img15off = new Image();          		
    img15off.src = "images/navigation/team.gif";     	
    }

// Function to "activate" images.
function imgAct(imgName) {
    if (br == "n3") {
    document[imgName].src = eval(imgName + "on.src");
    }
}

// Function to "deactivate" images.
function imgInact(imgName) {
    if (br == "n3") {
    document[imgName].src = eval(imgName + "off.src");
    }
}