browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion);

if (browser_name == "Netscape" && browser_version >= 3.0) { browser_ok = 'true'; }
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0) { browser_ok = 'true'; }
else { browser_ok = 'false'; }

function change(img, ref) {
   if (browser_ok == 'true') {
       document.images[img].src = ref;
   }
}

if (browser_ok == 'true')
{
a1=new Image; a1.src="images/cd1_on.gif";
a2=new Image; a2.src="images/cd2_on.gif";
a3=new Image; a3.src="images/cd3_on.gif";
}

var iwin = null;
function new_win(w,h) {
close_win();
iwin=window.open('',"iwin","resizable=no,menubar=no,status=no, top=30, left=30; scrollbars=no,width="+w+",height="+h);
}
function close_win() {if (iwin && !iwin.closed) iwin.close();}