mh-geotrust-shortcode.php

<?php
/*
Plugin Name: GeoTrust QuickSSL Icon Shortcode
Description: Use [mh-geotrust] to insert the QuickSSL Premium True Site Seal into your post or page.
Author: Jan Dembowski
Version: 0.1

From http://wordpress.org/support/topic/adding-a-geotrust-malware-seal-to-a-wordpress-website

*/

add_shortcode( 'mh-geotrust', 'mh_geotrust_seal' );
function mh_geotrust_seal( $atts ) {
    $mh_text = <<<'EOD'
    <!-- GeoTrust QuickSSL [tm] Smart  Icon tag. Do not edit. -->
    <SCRIPT LANGUAGE="JavaScript"  TYPE="text/javascript"
    SRC="//smarticon.geotrust.com/si.js"></SCRIPT>
    <!-- end  GeoTrust Smart Icon tag -->
EOD;
    return $mh_text;
}