this is the code ytpopup type:
{ytpopup type="image" content="images/customhtml/santuario-aereo.jpg" title="Sample image"}
<img src="images/customhtml/santuario-aereo-thumb.jpg" border="0" alt=""/> Santuário {/ytpopup}
{ytpopup type="image" content="images/customhtml/crisma.jpg" title="Sample image"}
<img src="images/customhtml/crisma-thumb.jpg" border="0" alt=""/> Crisma no Santuário {/ytpopup}
{ytpopup type="image" content="images/customhtml/santuario2.jpg" title="Sample image"}
<img src="images/customhtml/santuario-thumb.jpg" border="0" alt=""/> Santuário {/ytpopup}
{ytpopup type="image" content="images/customhtml/procissao.jpg" title="Sample image"}
<img src="images/customhtml/procissao-thumb.jpg" border="0" alt=""/> Procissão 2011 {/ytpopup}

Dear aster,
You can consult the following link:
demo.smartaddons.com/extensions/joomla15/index.php?option=com_content&view=article&id=442&Itemid=195