undefined method: dn_get, head...

htmldoc.inc.php

1. dn_get
line 31
$this->head->addValue( "\n<!-- ".dn_get('dn_copyright')."-->\n" );

line 37
$meta->addAttribute('content', dn_get('dn_copyright'));

dn_get function are not in the two php files.



2. head
$this->head = $this->html->addValue(new htmltag('head'));

head function are not in the two php files.