HTML5 Shim in functions.php Might as well keep your header.php clean and insert the shim from the functions.php file. The shim is to enable HTML5 elements to be able to be styled through CSS in Internet Explorer versions less than 9.
<?php
// add ie conditional html5 shim to header
function add_ie_html5_shim () {
echo '<!--[if lt IE 9]>';
echo '<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>';
echo '<![endif]-->';
}
add_action('wp_head', 'add_ie_html5_shim');
?>