Thanks Andrew & bottleneck
Here is the code from the header.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "https://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="https://www.w3.org/1999/xhtml">
<head profile="https://gmpg.org/xfn/11">
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
<title><?php bloginfo('name'); ?><?php wp_title(); ?></title>
<style type="text/css" media="screen">
@import url( <?php bloginfo('stylesheet_url'); ?> );
</style>
<link rel="icon" href="<?php bloginfo('siteurl'); ?>/favicon.ico" type="image/x-icon" />
<link rel="shortcut icon" href="<?php bloginfo('siteurl'); ?>/favicon.ico" type="image/x-icon" />
<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="<?php bloginfo('rss2_url'); ?>" />
<link rel="alternate" type="text/xml" title="RSS .92" href="<?php bloginfo('rss_url'); ?>" />
<link rel="alternate" type="application/atom+xml" title="Atom 0.3" href="<?php bloginfo('atom_url'); ?>" />
<link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />
<script src="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script src="text/javascript">
$('.gallery-icon a').attr('rel', 'lightframe');
</script>
<?php wp_get_archives('type=monthly&format=link'); ?>
<?php wp_head(); ?>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-39802109-1', 'air-8.com');
ga('send', 'pageview');
</script>
</head>
<body <?php body_class();?>>
<div id="wrapper">
<div id="main">
<div id="header">
<div id="logo"><a href="<?php bloginfo('url'); ?>"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/air8-logo.jpg" /></a></div>
<div id="navcontainer">
<div id="snlogos"><a href="https://www.facebook.com/pages/Air8-Event-Structures/145319808859771" target="_blank"><img src="<?php bloginfo('stylesheet_directory'); ?>/images/facebook.jpg" /></a></div>
<?php if (has_nav_menu('main-menu')) { ?>
<?php wp_nav_menu(array('theme_location' => 'main-menu')); ?>
<?php } else { ?>
Please create a new menu in your admin
<?php } ?>
</div>
</div>
<div id="content">
Are there several errors here? One <script> tag related and one src related…
