i thinl this is an interesting mod, but i have a suggestion so that users dont need to add there domain, i've already done it for my own site for my footer
using template modification system, you can change a simple piece of html code from a user typing
domain.com to $vboptions[bburl]
chnage your code to
Code:
<center>
<a href="http://safeweb.norton.com/report/show?url=$vboptions[bburl]" target="_blank"><img src="images/10ynzi9.gif" border="0" alt="$vboptions[bburl] tested by McAfee Security" title="$vboptions[bburl] tested by McAfee Security"></a>
<a href="http://www.siteadvisor.com/sites/$vboptions[bburl]" target="_blank"><img src="images/2e2fip2.gif" border="0" alt="$vboptions[bburl] tested by McAfee Security" title="$vboptions[bburl] tested by McAfee Security"></a>
</center>
i have the template.xml file ready for template Modification System if you havent already done so