<!--
browserName = navigator.appName;
browserVersion = parseInt(navigator.appVersion);
if (((browserName == "Netscape") && (browserVersion >= 3)) || ((browserName == "Microsoft Internet Explorer") && (browserVersion >= 4))) useImages = "1";
else useImages = "0";

if (useImages == "1")
{
he_a=new Image;
he_a.src="/i/g_a_he.jpg";
ne_a=new Image;
ne_a.src="/i/g_a_ne.jpg";
xe_a=new Image;
xe_a.src="/i/g_a_xe.jpg";
kr_a=new Image;
kr_a.src="/i/g_a_kr.jpg";
gases=new Image;
gases.src ="/i/g_na.jpg";
}

function ButtonOn(buttonId, gasName)
{
	ButtonOn_1(buttonId,gasName);
}
function ButtonOff(buttonId, gasName)
{
	ButtonOff_1(buttonId,gasName);
}
function ButtonOn_1(buttonId,gasName)
{
	 if ((document.images) && (useImages == "1"))
	 {
		imgOn = eval(gasName + "_a.src");
		document.images[buttonId].src = imgOn;
 	}
}

function ButtonOff_1(buttonId)
{
	 if ((document.images) && (useImages == "1"))
	 {
  		imgOff = eval(buttonId + ".src");
		document.images[buttonId].src = imgOff;
 	}
}
//-->