"Only secure content is displayed" Message"

When viewing records in Microsoft Dynamics CRM, Internet Explorer is displaying messages of the form "Only secure content is displayed".

In the organization that I investigated, the web binding for the CRM website was changed from http to https after installation. However, the setting for the HelpServerUrl field in the MSCRM_CONFIG database still had the old binding information.

I'm grateful to http://laurentbel.com/2011/12/16/dynamics-crm-2011-error-only-secure-content-is-displayed/ for providing this information.