var n3 = false;
image1       = new Image();  image1.src   = "images/kidsa.gif";
image1on     = new Image();  image1on.src = "images/kidsb.gif";

image2       = new Image();  image2.src   = "images/falla.gif";
image2on     = new Image();  image2on.src = "images/fallb.gif";

function on3(name)
{    document[name].src = eval(name + "on.src");   }

function off3(name)
{    document[name].src = eval(name + ".src");     }

n3 = true;
function on(name)
{
   if (n3)
      on3(name);
}

function off(name)
{
   if (n3)
      off3(name);
}