Hi!
ist easy
1.) copy "shiftzoom.js" in your root.
2.)in header.html search
{if has_rss}
insert above:
<script type="text/javascript" src="shiftzoom.js"></script>
3.) search in templates/yourTemplates/media/jpg.html
<img src="{media_src}" border="1" alt="{image_name}" {width_height} ><br>
and replace
<img onLoad="shiftzoom.add(this,{showcoords:true,zoom:100});" src="{media_src}" border="1" alt="{image_name}" width="450" height="300" ><br>
mfg Andi