I use attributes as follows:

<p class="contact-box-title">Contact Details
<strong>Name</strong><br/>
#_ATT{Contact Name}{N/A}<br/><br/>
<strong>Email</strong><br/>
<a href="mailto:#_ATT{Contact Email}?subject=#_NAME - #j #M #Y">Send an Email</a><br/><br/>
<strong>Phone</strong><br/>
#_ATT{Contact Phone}{N/A}<br/><br/>
<strong>Related links</strong><br/>
<a href="http://#_ATT{Contact Website}">Visit Website</a>
</div>

How do I hide an attribute, for example if there is no website to link to?