if (document.images) {
   homeOn = new Image();
   homeOn.src = "images/toplinks/home-on.gif";
   homeOff = new Image();
   homeOff.src = "images/toplinks/home-off.gif";
   }

if (document.images) {
   weddingOn = new Image();
   weddingOn.src = "images/wedding-suit-hire-on.jpg";
   weddingOff = new Image();
   weddingOff.src = "images/wedding-suit-hire-off.jpg";
   }

if (document.images) {
   eveningOn = new Image();
   eveningOn.src = "images/evening-suit-hire-on.jpg";
   eveningOff = new Image();
   eveningOff.src = "images/evening-suit-hire-off.jpg";
   }

if (document.images) {
   schoolOn = new Image();
   schoolOn.src = "images/school-prom-suits-on.jpg";
   schoolOff = new Image();
   schoolOff.src = "images/school-prom-suits-off.jpg";
   }

function activate(image_name) {
   if (document.images) {
       document[image_name].src = eval(image_name + "On.src");
   }
   }

function deactivate(image_name) {
   if (document.images) {
       document[image_name].src = eval(image_name + "Off.src");
   }
}