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

image2       = new Image();  image2.src   = "images/bhisx.gif";
image2on     = new Image();  image2on.src = "images/bhis.gif";

image3       = new Image();  image3.src   = "images/bpfx.gif";
image3on     = new Image();  image3on.src = "images/bpf.gif";
 
image4       = new Image();  image4.src   = "images/bax.gif";
image4on     = new Image();  image4on.src = "images/ba.gif";

image5       = new Image();  image5.src   = "images/bnx.gif";
image5on     = new Image();  image5on.src = "images/bn.gif";

image6       = new Image();  image6.src   = "images/btx.gif";
image6on     = new Image();  image6on.src = "images/bt.gif";

image7       = new Image();  image7.src   = "images/bdx.gif";
image7on     = new Image();  image7on.src = "images/bd.gif";

image8       = new Image();  image8.src   = "images/bcx.gif";
image8on     = new Image();  image8on.src = "images/bc.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);
}