//css sniffer
<!--
browser_version= parseInt(navigator.appVersion);
browser_type = navigator.appName;

if (browser_type == "Microsoft Internet Explorer" && (browser_version >= 4)) {
document.write("<link REL='stylesheet' HREF='css/style_ie.css' TYPE='text/css'>");
}

else if (browser_type == "Netscape" && (browser_version >= 4)) {
document.write("<link REL='stylesheet' HREF='css/style_nn.css' TYPE='text/css'>");
}


//popup
function openWindow(filename,width,height) {
	window.open(filename,'demowindow','width='+width+',height='+height+',resizable=1')
}


//rollovers

if (document.images)  {

		img5on = new Image ();
                img5on.src = "graphics/error_ok_on.gif";

 		img5off = new Image ();
                img5off.src = "graphics/error_ok.gif";
	             }

function imgSwap (imgName,imgFile)  {
        if (document.images)  {
                document.images[imgName].src = eval (imgFile + ".src");
        }
}