// 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";

// Rollover code 
    if (br== "n3") { 
    img1on = new Image();         
    img1on.src = "images/circle01_on.jpg";
	img2on = new Image();         
    img2on.src = "images/circle02_on.jpg";
	img3on = new Image();         
    img3on.src = "images/circle03_on.jpg";
	img4on = new Image();         
    img4on.src = "images/circle04_on.jpg";
	img5on = new Image();         
    img5on.src = "images/circle05_on.jpg";


    img1off = new Image();          
    img1off.src = "images/circle01_off.jpg"; 
	img2off = new Image();          
    img2off.src = "images/circle02_off.jpg";
	img3off = new Image();          
    img3off.src = "images/circle03_off.jpg";
	img4off = new Image();          
    img4off.src = "images/circle04_off.jpg";
	img5off = new Image();          
    img5off.src = "images/circle05_off.jpg";

	
    }
// 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");
    }
}