[horde] Open link in new window

[AJ]

Hi,
  I have defined a new horde app in registry.php like this:

$this->applications['link1'] = array(
    'webroot' => 'http://www.cnn.com',
    'icon' => '/horde/graphics/horde.gif',
    'name' => _("CNN"),
    'status' => 'active',
);

I am looking to open this in a new window as opposed to the main horde/imp
frame.
How can I go about this?

Thanks
AJ