ok, without any code we're pretty much useless, however
from looking at the source of that page you can clearly see that you are calling the following code
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Navbar</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
several times, which maybe the cause of your problem.