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<?php  if ( $_product->getData('imagen_360') ) { ?>
<script type="text/javascript">
    var left = (screen.width/2)-(800/2);
    var top = (screen.height/2)-(850/2);
</script>
<a href="#" class="360-link"  onclick="popWin('<?php echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA).'photos_360/'.$_product->getData('imagen_360'); ?>','_blank','width=800,height=850,top='+top+',left='+left+',replace=true'); return false;">360º</a>
<?php } ?>