class LinkImageItem extends DataObject
{
   static $db = array (      
      'Caption' => 'Text'
   );
   
   static $has_one = array (
      'LinkImage' => 'Image',
      'Page' => 'Page',
      'Link' => 'SiteTree'
   );
   
   public function getCMSFields_forPopup()
   {
      return new FieldSet(
         new TextField('Caption','Caption'),
         new SimpleTreeDropdownField("LinkID", "Select a page to link to", "SiteTree"),
         new ImageField('LinkImage','Link Image')
      );
   }
}

class Page extends SiteTree {
   
   public static $db = array();
   
   public static $has_one = array();
   
   public static $has_many = array(   
   'ResourceFile' => 'File',
   'LinkImageItems' => 'LinkImageItem'   
   );   
   static $icon = "themes/smartpack/images/treeicons/page";   
   
   public function getCMSFields()
   {
      $f = parent::getCMSFields();
      
      $f->addFieldsToTab("Root.Content.ResourceFiles", new AssetManager($this,"ResourceFiles","ResourceFile"));
      
      // setup the page link images
      
      $manager = new ImageDataObjectManager(
         $this, // Controller
         'LinkImageItems', // Source name
         'LinkImageItem', // Source class
         'LinkImage', // File name on DataObject
         array('Name' => 'Name'),
         'getCMSFields_forPopup' );
         
$f->addFieldToTab("Root.Content.LinkItems",$manager);
      
      return $f;
      }   
   
}

<% control LinkImageItems %>

$LinkImage
<a href="$Link">$Caption</a>

<% end_control %>