bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVer >= 3) || (bName == "Microsoft Internet Explorer" && bVer >= 4)) version = "n3";
else version = "n2";
               
if (version == "n3") {
    home_on = new Image();
    home_off = new Image();
    home_on.src = "images/nav_home_on.gif";
    home_off.src = "images/nav_home_off.gif";
    
    tornearlobe_on = new Image();
    tornearlobe_off = new Image();
    tornearlobe_on.src = "images/nav_torn_earlobe_on.gif";
    tornearlobe_off.src = "images/nav_torn_earlobe_off.gif";
    
    keloid_on = new Image();
    keloid_off = new Image();
    keloid_on.src = "images/nav_keloid_on.gif";
    keloid_off.src = "images/nav_keloid_off.gif";
    
    patientform_on = new Image();
    patientform_off = new Image();
    patientform_on.src = "images/nav_patient_form_on.gif";
    patientform_off.src = "images/nav_patient_form_off.gif";
	
    contact_on = new Image();
    contact_off = new Image();
    contact_on.src = "images/nav_contact_on.gif";
    contact_off.src = "images/nav_contact_off.gif";	
    
}

function rollOn (imgName) {
	if (version == "n3") {
        imgOn = eval(imgName + "_on.src");
        document[imgName].src = imgOn;
	}
}

function rollOff (imgName) {
	if (version == "n3") {
        imgOff = eval(imgName + "_off.src");
        document[imgName].src = imgOff;
	}
}