bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVer >= 3) ||
	(bName == "Microsoft Internet Explorer" && bVer >= 4)) br = "n3";
else br = "n2";

//create image objects, preload active and inactive states

if (br== "n3") {
	img1on = new Image();
	img1on.src = "/display_images/nav_aboutus_on.gif";
	img2on = new Image();
	img2on.src = "/display_images/nav_info_on.gif";
	img3on = new Image();
	img3on.src = "/display_images/nav_whatsnew_on.gif";
	img4on = new Image();
	img4on.src = "/display_images/nav_getinvolved_on.gif";
	img5on = new Image();
	img5on.src = "/display_images/nav_giving_on.gif";
	img6on = new Image();
	img6on.src = "/display_images/nav_research_on.gif";
	img7on = new Image();
	img7on.src = "/display_images/nav_helpline_on.gif";
	
	img1off = new Image();
	img1off.src = "/display_images/nav_aboutus_off.gif";
	img2off = new Image();
	img2off.src = "/display_images/nav_info_off.gif";
	img3off = new Image();
	img3off.src = "/display_images/nav_whatsnew_off.gif";
	img4off = new Image();
	img4off.src = "/display_images/nav_getinvolved_off.gif";
	img5off = new Image();
	img5off.src = "/display_images/nav_giving_off.gif";
	img6off = new Image();
	img6off.src = "/display_images/nav_research_off.gif";
	img7off = new Image();
	img7off.src = "/display_images/nav_helpline_off.gif";
}

function imgAct(imgName) {
	if (br== "n3") {
		document[imgName].src = eval(imgName + "on.src");
	}
}

function imgInact(imgName) {
	if (br== "n3") {
		document[imgName].src = eval(imgName + "off.src");
	}
}