[Plugin: WordPress HTTPS] possible https with Google viewer

Is there a way to retain secure site settings (https://) while using this plug-in (PDF and PPT Viewer – http://vladimir-k.blogspot.com/2009/09/pdf-and-ppt-viewer-wordpress-plugin-for.html).

The pdf files all reside within my secure server, but when I open the pdf viewer in another window – the URL for the viewer is not secure.

I’ve attempted to contact the plug-in developer but to no avail.

Please advise.