$output='<p>'.t('This page provides a drag-and-drop interface for assigning a block to a region, and for controlling the order of blocks within regions. Since not all themes implement the same regions, or display regions in the same way, blocks are positioned on a per-theme basis. Remember that your changes will not be saved until you click the <em>Save blocks</em> button at the bottom of the page. Click the <em>configure</em> link next to each block to configure its specific title and visibility settings.').'</p>';
$output.='<p>'.l(t('Demonstrate block regions (@theme)',array('@theme'=>$themes[$demo_theme]->info['name'])),'admin/structure/block/demo/'.$demo_theme).'</p>';