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
    
}