board01_off  = new Image(); board01_off.src = "img/link1a.gif";
board02_off  = new Image(); board02_off.src = "img/link2a.gif";
board03_off  = new Image(); board03_off.src = "img/link3a.gif";
board04_off  = new Image(); board04_off.src = "img/link4a.gif";
board05_off  = new Image(); board05_off.src = "img/link5a.gif";
board06_off  = new Image(); board06_off.src = "img/link6a.gif";

board01_on  = new Image(); board01_on.src  = "img/link1b.gif";
board02_on  = new Image(); board02_on.src  = "img/link2b.gif";
board03_on  = new Image(); board03_on.src  = "img/link3b.gif";
board04_on  = new Image(); board04_on.src  = "img/link4b.gif";
board05_on  = new Image(); board05_on.src  = "img/link5b.gif";
board06_on  = new Image(); board06_on.src  = "img/link6b.gif";


function act(S) 
{
  imgOn   = eval(S+"on.src");
  document[S].src = imgOn;
  return true;
}

function unact(S) 
{
  imgOff  = eval(S+"off.src");
  document[S].src = imgOff;
  return true;
}