Index: moodle/mod/lamslesson/settings.php
===================================================================
diff -u -rc44c0c3cd8e78b1f39ce9028d3d3ef6f6a250543 -r26759e4a3721b0115d50efc85b883261c0ded334
--- moodle/mod/lamslesson/settings.php	(.../settings.php)	(revision c44c0c3cd8e78b1f39ce9028d3d3ef6f6a250543)
+++ moodle/mod/lamslesson/settings.php	(.../settings.php)	(revision 26759e4a3721b0115d50efc85b883261c0ded334)
@@ -51,7 +51,7 @@
     $html = html_writer::script('', $CFG->wwwroot.'/mod/lamslesson/validate.js');
     $html .=  html_writer::tag('p', get_string('validationinfo', 'lamslesson')); 
     $html .=  html_writer::start_tag('div', array('style' => 'text-align:center;padding-top: 15px; padding-bottom:5px;'));
-    $html .=  html_writer::start_tag('span', array('id' => 'validatebutton', 'class' => 'yui-button yui-link-button'));
+    $html .=  html_writer::start_tag('span', array('id' => 'validatebutton', 'class' => 'yui3-button yui3-link-button'));
     $html .=  html_writer::tag('a', get_string('validationbutton', 'lamslesson'), 
 		array('id' => 'validatebtn', 
 			'name' => 'validatebtn',