chrome can be strict when dealing with iframes
in the iframe source, you are refering to the domain without the www:
<iframe scrolling="no" src="http://shetek.org/shetekgallery/galleries/slideshow_dissolve/index.php?gallery=23&theme=light " width="425" height="325" frameborder="0"></iframe>
this will fail to load properly if you visit the page using the www domain:
www.shetek.org
if you instead, visit the page using the same domain as the iframe source:
shetek.org
it will work.