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
}