browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))             
             
if (browser) {

  aOn = new Image();
  aOn.src = "images/b_longevity_information_on.gif";
  aOff = new Image();   
  aOff.src = "images/b_longevity_information_off.gif";

  bOn = new Image();
  bOn.src = "images/b_products_on.gif";
  bOff = new Image();   
  bOff.src = "images/b_products_off.gif";

  cOn = new Image();
  cOn.src = "images/b_programs_and_services_on.gif";
  cOff = new Image();   
  cOff.src = "images/b_programs_and_services_off.gif";

  dOn = new Image();
  dOn.src = "images/b_longevity_lab_on.gif";
  dOff = new Image();   
  dOff.src = "images/b_longevity_lab_off.gif";

  eOn = new Image();
  eOn.src = "images/b_about_us_on.gif";
  eOff = new Image();   
  eOff.src = "images/b_about_us_off.gif";

  fOn = new Image();
  fOn.src = "images/b_contact_information_on.gif";
  fOff = new Image();   
  fOff.src = "images/b_contact_information_off.gif";

  gOn = new Image();
  gOn.src = "images/b_face_rejuvenation_on.gif";
  gOff = new Image();   
  gOff.src = "images/b_face_rejuvenation_off.gif";
}

function img_act(imgName) {
	if (browser) {
    	imgOn = eval(imgName + "On.src");
		msg = eval(imgName + "On.msg")
		window.status = msg;
	   	document [imgName].src = imgOn;		    	
  	}
}

function img_inact(imgName) {
  if (browser) {
    	imgOff = eval(imgName + "Off.src");
    	document [imgName].src = imgOff;
		window.status = "";
  	}
}

function popup(file) {
	window.open(file,'name','width=300,height=225,top=200,left=200,scrollbars=1,resizable=1,status=0,location=0,toolbar=0,menubar=0');
}

function popup_large(file,target) {
	window.open(file,target,'width=500,height=375,top=100,left=100,scrollbars=1,resizable=1,status=0,location=0,toolbar=0,menubar=0');
}