diff --git a/plugins/serendipity_event_nl2br/serendipity_event_nl2br.php b/plugins/serendipity_event_nl2br/serendipity_event_nl2br.php
index 9d3f9266..b6efcbcf 100644
--- a/plugins/serendipity_event_nl2br/serendipity_event_nl2br.php
+++ b/plugins/serendipity_event_nl2br/serendipity_event_nl2br.php
@@ -436,7 +436,7 @@ p.wl_notopbottom {
 								'acronym', 'cite', 'code', 'dfn', 'em', 'kbd', 'strong',
 								'samp', 'var', 'a', 'bdo', 'bdi', 'map', 'object',
 								'q', 'script', 'span', 'sub', 'sup', 'button',
-								'label', 'select', 'textarea', 's' 
+								'label', 'select', 'textarea', 's', 'strike' 
 								);
 
 	var $allowed_p_parents = array('blockquote', 'td', 'div', 'article', 'aside', 'dd',
@@ -542,9 +542,16 @@ p.wl_notopbottom {
 				{
 					// unknown tag definition
 					$text[$tagstart_b] = '<';
-					$text[strpos($textstring,'>',$i)] = '>';
+					$tagstart = false;
+					$tagdef = false;
+					if ( $text[$i] == '>' ) {	$text[$i] = '>'; }
 				} else
 				{ 
+					//convert to lowercase
+					for ($j = $tagdef; $j <= $i; $j++)
+					{
+						$text[$j] = strtolower($text[$j]);
+					}
 					$tagdef = false;
 					// closing >
 					if ($text[$i] == '>')
@@ -583,11 +590,7 @@ p.wl_notopbottom {
 				$tagdef = $i;
 				$tagstart_b = $tagstart;
 				$tagstart = false;
-				$text[$i] = strtolower($text[$i]);
 			}
-			// definition characters
-			elseif ($tagdef)
-			{	$text[$i] = strtolower($text[$i]); }
 			// quotes in style - isolate
 			elseif ($tagstyle && $text[$i] == '\'' && !$doublequote )
 			{