The problem is that you are loading the swf from url 'http://alexevansphotography.com/gallery … viewer.swf'. Note the missing 'www'. This causes a security error when flash tries to load a background image from a different subdomain.
The solution is to change this line in your HTML page:
swfobject.embedSWF("http://alexevansphotography.com/gallery/simpleviewer.swf", "flashContent", "600", "640", "9.0.124", false, flashvars, params);
to this:
swfobject.embedSWF("/gallery/simpleviewer.swf", "flashContent", "600", "640", "9.0.124", false, flashvars, params);
Also you can set the background color by changing this line to color you require:
params.bgcolor = "FFFFFF";
Felix Turner
SimpleViewer Support Team.