change the icon of a custom post type in WordPress to use twitter boostrap

I always like using this tutorial which would give you this code.

<?php
add_action( 'admin_head', 'cpt_icons' );
function cpt_icons() {
    ?>
    <style type="text/css" media="screen">
        #menu-posts-POSTTYPE .wp-menu-image {
            background: url(<?php bloginfo('template_url') ?>/images/YOURIMAGE.png) no-repeat 6px -17px !important;
        }
    #menu-posts-POSTTYPE:hover .wp-menu-image, #menu-posts-POSTTYPE.wp-has-current-submenu .wp-menu-image {
            background-position:6px 7px!important;
        }
    </style>
<?php } ?>