//thank you lastminute.nl :P
function lightOn(o, c){
  if (document.getElementById || (document.all && !(document.getElementById))) {
    o.style.backgroundColor = c;
  }
}

function lightOff(o, c){
  if(document.getElementById || (document.all && !(document.getElementById))){
    o.style.backgroundColor = c;
  }
}