function initButtons() {
   for (i = 1; i <= 3; i++) {
      element = document.getElementById("btn" + i);
      element.onmouseover = lightOn;
      if (element.captureEvents)
         element.captureEvents(Event.MOUSEOVER);
      element.onmouseout = lightOff;
      if (element.captureEvents)
         element.captureEvents(Event.MOUSEOUT);
   }
}

function lightOn(e) {
   if (!e) var e = window.event;
   element = document.getElementById(this.id + "light");
   if (element.className == "light lightOff") {
      element.style.opacity = 0.1;
      element.style.filter = "alpha(opacity=10)";
   }
}

function lightOff(e) {
   if (!e) var e = window.event;
   element = document.getElementById(this.id + "light");
   if (element.className == "light lightOff") {
      element.style.opacity = 0.0;
      element.style.filter = "alpha(opacity=0)";
   }
}