function opacity (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;
	}
}