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
   }