var isNS = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 4);
var HIDDEN = (isNS) ? 'hidden' : 'hidden';
var VISIBLE = (isNS) ? 'visible' : 'visible';

function img_act(imgName) { 
	if (document.images) { 
		imgOn = eval (imgName + "on.src"); 
		document [imgName].src = imgOn;
	}
} 

function img_inact(imgName) { 
	if (document.images) { 
		imgOff = eval(imgName + "off.src"); 
		document [imgName].src = imgOff; 
	}
} 

function ShowBox(name,type) {
	if(isNS) 
		b = document.getElementById(name); //eval("b = document."+name+";");
	else
		eval("b = "+name+";");
	b.style.visibility = type;
}