browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))

if (browser){
	toc1on = new Image () ;
	toc1on.src = "/cov2_r2-c2-on.jpg";
	toc2on = new Image () ;
	toc2on.src = "/cov2_r4-c1-on.gif";
	toc3on = new Image () ;
	toc3on.src = "/cov2_r5-c2-on.jpg";

	toc1off = new Image () ;
	toc1off.src = "/cov2_r2-c2-off.jpg";
	toc2off = new Image () ;
	toc2off.src = "/cov2_r4-c1-off.jpg";
	toc3off = new Image () ;
	toc3off.src = "/cov2_r5-c2-off.jpg";
}

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