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<?php
// add ie conditional html5 shiv to header
function add_ie_html5_shiv ()
{
    echo '<!--[if lt IE 9]>';
    echo '<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>';
    echo '<![endif]-->';
}
add_action('wp_head', 'add_ie_html5_shiv');
?>