diff --git a/epub.php b/epub.php
index 3ca211c..1330187 100644
--- a/epub.php
+++ b/epub.php
@@ -53,6 +53,16 @@
 		return $temp_img_path;
 	}
 
+	function inner_html($node)
+	{
+		$innerHTML = '';
+		foreach ($node->childNodes as $childNode)
+		{
+			$innerHTML .= $childNode->ownerDocument->saveHTML($childNode);
+		}
+		return $innerHTML;
+	}
+
 	date_default_timezone_set('Europe/Paris');
 	$date = (new DateTime('today'))->format('Ymd');