1) You can first adjust height as suggested here::
http://www.joomlart.com/forums/topic/reduce-droid-slideshow-height/
which would give you room/space below slideshow images for shadow image to appear
2) Now, Change this::
#ja-slideshow {mod_ja…ow2.css (line 15)
border-top: 1px solid #000000;
overflow: hidden;
position: relative;
z-index: 10;
}
to
#ja-slideshow {mod_ja…ow2.css (line 15)
background: url(“../images/shadow.jpg”) no-repeat scroll 0 100% #000;
border-top: 1px solid #000000;
overflow: hidden;
position: relative;
z-index: 10;
}
and update image path accordingly