<!--
if (document.images)
{
  topon= new Image(100,25);
  topon.src="/images/top_on.gif";
  
  topoff= new Image(100,25);
  topoff.src="/images/top_off.gif";
}

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }

//-->