Part of the problem is that you have doubled your <HEAD> section:
This is from the source of your page:

Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en">
<head>
<title>Diva Knitting, Knitting Supplies and Other Cool Stuff</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta name="keywords" content="Knitting Cards Stitch Markers Sock Yarn Needles Knitting Jewelry Gift Certificates Project Spectrum Purse Handles Accessories and Notions Swifts and Winders Diva Logo Merchandise Knitting Bags Yarn Patterns/Kits Other Cool Stuff Dye knitting, knit, qiviut, yarn, luxury yarn, wool, handpainted, hand painted, hand dyed, sock yarn, Opal, diakeito, Muskox, ecommerce, open source, shop, online shopping " />
<meta name="description" content="Diva Knitting :  - Knitting Cards Stitch Markers Sock Yarn Needles Knitting Jewelry Gift Certificates Project Spectrum Purse Handles Accessories and Notions Swifts and Winders Diva Logo Merchandise Knitting Bags Yarn Patterns/Kits Other Cool Stuff Dye knitting, knit, qiviut, yarn, luxury yarn, wool, handpainted, hand painted, hand dyed, sock yarn, Opal, diakeito, Muskox, ecommerce, open source, shop, online shopping" />
<link rel="icon" href="/favicon.ico" type="image/x-icon" /><link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" /> 
<meta http-equiv="imagetoolbar" content="no" />
<meta name="authors" content="The Zen Cart&trade; Team and others" />
<meta name="generator" content="shopping cart program by Zen Cart&trade;, http://www.zen-cart.com" />
<base href="http://www.divaknitting.com/testzenstore/" />

<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/style_imagehover.css" />
<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/stylesheet.css" />
<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/stylesheet_categories_menu.css" />

<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/stylesheet_css_buttons.css" />
<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/stylesheet_ezpagesnav.css" />
<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/stylesheet_sg_picture_frame.css" />
<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/stylesheet_sg_zc130.css" />
<link rel="stylesheet" type="text/css" media="print" href="includes/templates/custom/css/print_stylesheet.css" />
<script type="text/javascript" src="includes/templates/template_default/jscript/jscript_imagehover.js"></script>
<script>
var cot_loc0=(window.location.protocol == "https:")? "https://secure.comodo.net/trustlogo/javascript/cot.js" :
"http://www.trustlogo.com/trustlogo/javascript/cot.js";
document.writeln('<script language="JavaScript" src="'+cot_loc0+'" type="text\/javascript"><\/script>');
</script>
</head>
<body id="indexBody">

<div id="mainWrapper">
    <table class="centershop" border="0" cellspacing="0" cellpadding="0">
      <tr><td>

        <table width="100%" border="0" cellspacing="0" cellpadding="0" class="headerNavigation">
          <tr>
            <td align="left" valign="top" width="35%" class="headerNavigation">
              <a href="http://www.divaknitting.com/testzenstore/index.php?main_page=index&amp;zenid=939ef51853df21fac681e8c0923cf25f">Home</a>&nbsp;|&nbsp;
              <a href="https://www.divaknitting.com/testzenstore/index.php?main_page=login&amp;zenid=939ef51853df21fac681e8c0923cf25f">Log In</a>
            </td>
            <td align="center" width="30%" class="headerNavigation"><form name="quick_find_header" action="http://www.divaknitting.com/testzenstore/index.php?main_page=advanced_search_result" method="get"><input type="hidden" name="main_page" value="advanced_search_result" /><input type="hidden" name="search_in_description" value="1" /><input type="hidden" name="zenid" value="939ef51853df21fac681e8c0923cf25f" /><input type="text" name="keyword" size="6" maxlength="30" style="width: 100px" value="Enter search keywords here" onfocus="if (this.value == 'Enter search keywords here') this.value = '';" />&nbsp;<input type="submit" value="Search" style="width: 45px" /></form></td>

            <td align="right" valign="top" width="35%" class="headerNavigation">
            </td>
          </tr>
        </table>
        <table border="0" width="100%" cellspacing="0" cellpadding="0" class="header">
          <tr><!-- All HEADER_ definitions in the columns below are defined in includes/languages/english.php //-->
            <td valign="middle" height="64px" width="192px">
<a href="http://www.divaknitting.com/testzenstore/index.php?main_page=index&amp;zenid=939ef51853df21fac681e8c0923cf25f"><img src="includes/templates/custom/images/logo.jpg" border="0" alt="Diva Knitting" title=" Diva Knitting " width="163" height="200" /></a>            </td>
            <td align="center" valign="top">

<h1<h1>            </td>
          </tr>
        </table>
<!--bof-optional categories tabs navigation display--><!--eof-optional categories tabs navigation display--><!--bof-header ezpage links-->


<head>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xml:lang="en">

<link rel="stylesheet" type="text/css" href="includes/templates/custom/css/stylesheet_ezpagesnav.css" />


<script language="JavaScript">
<!--

function SymError()
{
  return true;
}

window.onerror = SymError;

var SymRealWinOpen = window.open;

function SymWinOpen(url, name, attributes)
{
  return (new Object());
}

window.open = SymWinOpen;

//-->

</script>



</head>

<body>