var NN3 = false;

tl_0_1= new Image();
tl_0_1.src = "obr/tl_0_1.gif";
tl_0_1l = new Image();
tl_0_1l.src = "obr/tl_0_1l.gif";

tl_0_2= new Image();
tl_0_2.src = "obr/tl_0_2.gif";
tl_0_2l = new Image();
tl_0_2l.src = "obr/tl_0_2l.gif";

tl_1= new Image();
tl_1.src = "obr/tl_1.gif";
tl_1l = new Image();
tl_1l.src = "obr/tl_1l.gif";

tl_2= new Image();
tl_2.src = "obr/tl_2.gif";
tl_2l = new Image();
tl_2l.src = "obr/tl_2l.gif";

tl_3= new Image();
tl_3.src = "obr/tl_3.gif";
tl_3l = new Image();
tl_3l.src = "obr/tl_3l.gif";

tl_4= new Image();
tl_4.src = "obr/tl_4.gif";
tl_4l = new Image();
tl_4l.src = "obr/tl_4l.gif";

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

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

NN3 = true;
function on(name)  {
  if (NN3) on3(name);
}
function off(name)  {
  if (NN3) off3(name);
}