var ns;
var oldid;
var layr;
var curr;
var imgsrc;
var id;

if(navigator.appName=="Netscape") {
  ns=1;
}

var isIE, isNS = false;

var isMac, isWin = false;

NavVersion = navigator.appVersion;
NavName = navigator.appName;

isNS = (NavName == 'Netscape')? true: false;
isIE = (NavName == 'Microsoft Internet Explorer')? true: false;

isMac = (NavVersion.indexOf ('Mac') != -1)? true: false;
isWin = (!isMac)? true: false;

knapp1on = new Image();
knapp1on.src = "/applications/Grid/images/header_info_over.gif";
knapp1off = new Image();
knapp1off.src = "/applications/Grid/images/header_info.gif";
knapp2on = new Image();
knapp2on.src = "/applications/Grid/images/header_expand_over.gif";
knapp2off = new Image();
knapp2off.src = "/applications/Grid/images/header_expand.gif";
knapp3on = new Image();
knapp3on.src = "/applications/Grid/images/header_expand2_over.gif";
knapp3off = new Image();
knapp3off.src = "/applications/Grid/images/header_expand2.gif";
	
	
	function swap(name,source,layr1,layr2) {
	if (isIE) {
		document.images[name].src = eval(source+".src");
	}
	else if (isNS) {
		document.layers[layr1].document.layers[layr2].document.images[name].src=eval(source+".src");
	}
}
	
	function swapb(name,source,layr1) {
	if (isIE) {
		document.images[name].src = eval(source+".src");
	}
	else if (isNS) {
		document.layers[layr1].document.images[name].src=eval(source+".src");
	}
}