Try to edit templates/jf_calla-exteriors/index.php, modify:
<?php if ($menu->getActive() == $menu->getDefault()) : ?>
<div id="jf-slideshow">
...
</div>
<?php endif ?>
to:
<?php if($this->countModules('slideshow')) : ?>
<div id="jf-slideshow">
...
</div>
<?php endif ?>
As a matter of fact I did not understand where the background slide (banner.jpg) is defined.
in template.css:
#jf-slideshow {
background: ...
}
joomfreak