diff --git a/phpgwapi/inc/class.html.inc.php b/phpgwapi/inc/class.html.inc.php
index a0e1e2c3e8..464db5eac3 100644
--- a/phpgwapi/inc/class.html.inc.php
+++ b/phpgwapi/inc/class.html.inc.php
@@ -215,7 +215,7 @@ class html
 		// enable target attributes
 		$config->set('Attr.AllowedFrameTargets','_blank,_top,_self,_parent');
 		// actual allowed tags and attributes
-		$config->set('URI.AllowedSchemes', array('http'=>true, 'https'=>true, 'ftp'=>true, 'file'=>true, 'cid'=>true));
+		$config->set('URI.AllowedSchemes', array('http'=>true, 'https'=>true, 'ftp'=>true, 'file'=>true, 'cid'=>true, 'data'=>true));
 		$config->set('AutoFormat.RemoveEmpty', true);
 		$config->set('HTML.Allowed', 'br,p[align],b,i,u,s,em,pre,tt,strong,strike,sub,sup,center,div[align|style],hr[class|style],'.
 					'font[size|color],'.
@@ -251,14 +251,14 @@ class html
 		$config->set('HTML.DefinitionID', 'deactivatelinks');
 		$config->set('HTML.DefinitionRev', 1);
 		// doctype and tidylevel
-			$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
+		$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
 		$config->set('HTML.TidyLevel', 'light');
 		// EnableID is needed for anchor tags
 		$config->set('Attr.EnableID',true);
 		// enable target attributes
 		$config->set('Attr.AllowedFrameTargets','_blank,_top,_self,_parent');
 		// actual allowed tags and attributes
-		$config->set('URI.AllowedSchemes', array('http'=>true, 'https'=>true, 'ftp'=>true, 'file'=>true, 'cid'=>true));
+		$config->set('URI.AllowedSchemes', array('http'=>true, 'https'=>true, 'ftp'=>true, 'file'=>true, 'cid'=>true, 'data'=>true));
 		$config->set('AutoFormat.RemoveEmpty', true);
 		$config->set('HTML.Allowed', 'br,p[align],b,i,u,s,em,pre,tt,strong,strike,sub,sup,center,div[align|style],hr[class|style],'.
 					'font[size|color],'.
@@ -1412,6 +1412,46 @@ class html
 		return HTMLPurifier_Config::createDefault();
 	}
 
+	/**
+	 * creates a HTMLPurifier default config for the needs of HTMLTidy
+	 *
+	 * @return HTMLPurifier_Config object
+	 */
+	static function purifyCreateHTMLTidyConfig()
+	{
+		$config = html::purifyCreateDefaultConfig();
+		// maybe the two following lines are useful for caching???
+		$config->set('HTML.DefinitionID', 'egroupwareHTMLTidyConfig');
+		$config->set('HTML.DefinitionRev', 1);
+		$config->set('Core.Encoding', (self::$charset?self::$charset:'UTF-8'));		// doctype and tidylevel
+		$config->set('Core.RemoveInvalidImg', false);
+		$config->set('HTML.Doctype', 'XHTML 1.0 Transitional');
+		$config->set('HTML.TidyLevel', 'light');
+		$config->set('Attr.EnableID',true);
+		// enable target attributes
+		$config->set('Attr.AllowedFrameTargets','_blank,_top,_self,_parent');
+		// actual allowed tags and attributes
+		$config->set('URI.AllowedSchemes', array('http'=>true, 'https'=>true, 'ftp'=>true, 'file'=>true, 'cid'=>true));
+		$config->set('AutoFormat.RemoveEmpty', true);
+		$config->set('HTML.Allowed', 'br,p[align],b,i,u,s,em,pre,tt,strong,strike,sub,sup,center,div[align|style],hr[class|style],'.
+					'font[size|color],'.
+					'ul[type],ol[type|start],li,'.
+					'h1,h2,h3,h4,h5,h6,'.
+					'span[class|style],'.
+					'table[class|border|cellpadding|cellspacing|width|style|align|bgcolor|align],'.
+					'tbody,thead,tfoot,colgroup,'.
+					'col[width|span],'.
+					'blockquote[class|cite|dir],'.
+					'tr[class|style|align|bgcolor|align|valign],'.
+					'td[class|colspan|rowspan|width|style|align|bgcolor|align|valign|nowrap],'.
+					'th[class|colspan|rowspan|width|style|align|bgcolor|align|valign|nowrap],'.
+					'a[href|target|name|title],'.
+					'img[src|alt|title|align|style|width|height]');
+		$config->set('URI.AllowedSchemes', array('http'=>true, 'https'=>true, 'ftp'=>true, 'file'=>true, 'cid'=>true, 'data'=>true));
+		$config->set('Cache.SerializerPath', ($GLOBALS['egw_info']['server']['temp_dir']?$GLOBALS['egw_info']['server']['temp_dir']:sys_get_temp_dir()));
+		return $config;
+	}
+
 	/**
 	 * Runs HTMLPurifier over supplied html to remove malicious code
 	 *