That should fix it.
Code:
<center>
<a href="http://safeweb.norton.com/report/show?url={vb:raw $vboptions[bburl]}" target="_blank"><img src="{vb:stylevar imgdir_misc}/norton.gif" border="0" alt="{vb:raw $vboptions[bburl]} tested by Norton Security" title="$vboptions[bburl] tested by Norton Security"></a>
<a href="http://www.siteadvisor.com/sites/{vb:raw $vboptions[bburl]}" target="_blank"><img src="{vb:stylevar imgdir_misc}/mcafee.gif" border="0" alt="{vb:raw $vboptions[bburl]} tested by McAfee Security" title="$vboptions[bburl] tested by McAfee Security"></a>
</center>