function addEvent(obj, evType, fn) {
  /* adds an eventListener for browsers which support it
     Written by Scott Andrew: nice one, Scott */
  if (obj.addEventListener){
    obj.addEventListener(evType, fn, false);
    return true;
  } else if (obj.attachEvent){
	var r = obj.attachEvent("on"+evType, fn);
    return r;
  } else {
	return false;
  }
}

function lightup(imageobject, opacity) {
	if (navigator.appName.indexOf("Netscape")!=-1&&parseInt(navigator.appVersion)>=5) {
		imageobject.style.MozOpacity=opacity/100;
	} else if (navigator.appName.indexOf("Microsoft")!=-1&&parseInt(navigator.appVersion)>=4) {
		imageobject.filters.alpha.opacity=opacity;
	} else if (navigator.appName.indexOf("Safari")!=-1&&parseInt(navigator.appVersion)>=1) {
		imageobject.style.Opacity =opacity/100;
	}
}