<?php if(!JFactory::getUser()->guest): ?>
// RENDER YOUR EXTRA FIELD HERE
<?php endif; ?>

<div class="itemExtraFields">
	  	<h3><?php echo JText::_('K2_ADDITIONAL_INFO'); ?></h3>
	  	<ul>
      <!-- GET USER -->
			<?php $user =& JFactory::getUser(); ?>
			<?php foreach ($this->item->extra_fields as $key=>$extraField): ?>
			<?php if($extraField->value != ''): ?>
			<li class="<?php echo ($key%2) ? "odd" : "even"; ?> type<?php echo ucfirst($extraField->type); ?> group<?php echo $extraField->group; ?>">
				<?php if($extraField->type == 'header'): ?>
				<h4 class="itemExtraFieldsHeader"><?php echo $extraField->name; ?></h4>
				<?php else: ?>
				<span class="itemExtraFieldsLabel"><?php echo $extraField->name; ?>:</span>
        <!-- CHECK IF THIS IS THE FIELD TO HIDE FROM ALL EXCEPT ADMINISTRATOR -->
				<?php if($extraField->name == 'FIELDTOHIDE' && $user->id != ADMIN-ID): ?>
          <span class="itemExtraFieldsValue"><?php echo "*** FIELD HIDDEN ***"; ?></span>
        <?php else: ?>
				  <span class="itemExtraFieldsValue"><?php echo $extraField->value; ?></span>
				<?php endif; ?>
			</li>
			<?php endif; ?>
			<?php endforeach; ?>
			</ul>
	    <div class="clr"></div>
	  </div>