My site CSS not showing up in windows IE6, 7 or 8

<!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">
<head>
	<title>[(site_name)] – [*pagetitle*]</title>
	<base href="[(base_url)]"
	<meta http-equiv="Content-Type" content="text/html; charset=[(modx_charset)]"/>
    <script type="text/javascript" src="assets/templates/infinity_tattoo/iefix/iepngfix_tilebg.js"></script>
	<script type="text/javascript" src="assets/templates/infinity_tattoo/scripts/jquery.js"></script>
	<script type="text/javascript" src="assets/templates/infinity_tattoo/scripts/easySlider1.7.js"></script>
	<script type="text/javascript">
		jQuery(document).ready(function(){	
			jQuery("#slider").easySlider({
				auto: true, 
				continuous: true,
				numeric: true
			});
		});	
	</script>
<link href="assets/templates/infinity_tattoo/css/infinity.css" rel="stylesheet" type="text/css" />
    <link href="assets/templates/infinity_tattoo/css/slider.css" rel="stylesheet" type="text/css" />
</head>

<base href="[(base_url)]"></base>