goog.userAgent.adobeReader Namespace.HAS_READER {boolean}Whether we detect the user has the Adobe Reader browser plugin installed.
.SILENT_PRINT {boolean}On certain combinations of platform/browser/plugin, a print dialog can be shown for PDF files without a download dialog or making the PDF visible to the user, by loading the PDF into a hidden iframe. Currently this variable is true if Adobe Reader version 6 or later is detected on Windows.
.VERSION {string}The version of the installed Adobe Reader plugin. Versions after 7 will all be reported as '7'.