<?php if ($this->countModules( 'user1 or user2' )) : ?>
<div class="user1user2">
<jdoc:include type="modules" name="user1" style="xhtml" />
<div class="greyline" />
<jdoc:include type="modules" name="user2" style="xhtml" />
<?php endif; ?>
</div>
<?php endif; ?>