It looks like the SimpleViewer Flash Player does not accept a query string in a link within the gallery title, although it works fine in the Mobile Player.
A possible workaround would be to overlay a standard HTML link on top of your gallery rather than include the link in the gallery title.
Include code such as the following in the <body> section of your gallery's 'index.html' page:
<div id="overlay" style="position: absolute; top: 10px; left: 10px; z-index: 9999;">
In order for this to work, you would also need to make your gallery's background transparent by following the instructions here.
SimpleViewer Support Team.