Less conspicuous Immediate Halt message

Currently the default phpds theme have a very loud "IMMEDIATE HALT!" message that is displayed with a very large halt image in the center.

I propose that a less conspicuous message is shown as in my example image. Together with this I propose that a "return to previous page" link is also supplied on this message.

Although the looks can be modified using a custom template and CSS the system currently does not support the addition of adding a link to the warning message without having to modify the template.class.php file.