Im not sure you are abiding by the rules of the gallery.
In their
FAQ's linked here... there should be some variable used in your site when using the viewer.
So you embed the viewer itself as simpleviewer.swf, so all instances should read simpleviewer.swf and not simpleviewer.swf?galleryURL=gallery.xml.
I have only brushed over it, i suggest you read up more on embeding the simple viewer on their website FAQ's for they hold the answers you require.
Richard Williams
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