function lighton(id)
  {
    document.getElementById("logo_" + id).src="/images/logo_on_"+id+".jpg";
  }
  
function lightoff(id)
  {
    document.getElementById("logo_" + id).src="/images/logo_"+id+".jpg";
  }
  
  
function on_line(id)
  {
    document.getElementById(id).src="/images/light_on_all.gif";
  }
  
function on_line2(id)  
    {
    document.getElementById(id).src="/images/light_on.gif";  
    }