added email helper
diff --git a/user_guide/nav/nav.js b/user_guide/nav/nav.js
index ef484f6..951c190 100644
--- a/user_guide/nav/nav.js
+++ b/user_guide/nav/nav.js
@@ -102,6 +102,7 @@
'<li><a href="'+base+'helpers/date_helper.html">Date Helper</a></li>' +
'<li><a href="'+base+'helpers/directory_helper.html">Directory Helper</a></li>' +
'<li><a href="'+base+'helpers/download_helper.html">Download Helper</a></li>' +
+ '<li><a href="'+base+'helpers/email_helper.html">Email Helper</a></li>' +
'<li><a href="'+base+'helpers/file_helper.html">File Helper</a></li>' +
'<li><a href="'+base+'helpers/form_helper.html">Form Helper</a></li>' +
'<li><a href="'+base+'helpers/html_helper.html">HTML Helper</a></li>' +