This is a sample of a Access message HTML file.

The URL "..." has been denied

In order to use the buttons, they must be as follows.

The URL element must have ID="url"
The Ok button must have ID="ButtonOK"
The Cancel button must have ID="ButtonCancel"
The Override button must have ID="ButtonOverride"
The Override Password input must have ID="password"

See the source of this sample.

Override Password: