diff --git a/README.md b/README.md
index 5f7dbf5..6450138 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 
 This project provides a script that searches all kanji's in a web page, adding a clickable link on
 all kanjis appearing on a web page. You can display the result on
-[this page](http://im.ufrj.br/~maurizio.monge/kanjax/test.html)
+[this page](http://im.ufrj.br/~maurizio.monge/kanjax/test.html).
 
 This library was inspired by MathJax, that automatically formats mathematical formulas in web pages.
 
diff --git a/kanjax/kanjax.js b/kanjax/kanjax.js
index 1b5c19f..1bc9a74 100644
--- a/kanjax/kanjax.js
+++ b/kanjax/kanjax.js
@@ -44,7 +44,10 @@ KanJax = {
 				content = KanJax.popupContent.replace(
 								/\{\{(\w+)\}\}/g,
 						function(match, key) {
-								return info[key] || ("{unknown field "+key+"}");
+								if(key in info)
+										return info[key]
+								else
+										return "{unknown field "+key+"}";
 						});
 				div.innerHTML = content;