You can use a URL action on a dashboard to open a specific web page (or image) in a Web Page object on the dashboard. The URL you specify in the dashboard action can include a dimension field from the workbook.
Alex Kerin had a nice example here QR code, where he used the dimension field [Sub-category] in the Superstore dataset to display a QR code from Google. From the dashboard in his workbook, select Dashboard > Actions and you'll see the hyperlink.
Jim - thanks. I'll try this out.