修改

app/views/users/_my_course.html.erb

@@ -22,7 +22,7 @@
 	<div style="clear:both;"></div>
 
 	<p>
-	<%= link_to l(:label_course_done)+"("+@memberships_done.count.to_s+")", 'javascript:void(0);', :onclick => '$("#courses_history_block").slideToggle(400);' , style: "color:#666666;" if User.current.logged? %>
+	<%= link_to l(:label_course_done)+"("+@memberships_done.count.to_s+")", 'javascript:void(0);', :onclick => '$("#courses_history_block").slideToggle(400);'  if User.current.logged? %>
 	</p>
 
 	<div id="courses_history_block" class="courses_history hidden" >

app/views/users/_my_joinedcourse.html.erb

@@ -22,7 +22,7 @@
 	<div style="clear:both;"></div>
 
 	<p>
-	<%= link_to l(:label_course_done)+"("+@memberships_done.count.to_s+")", 'javascript:void(0);', :onclick => '$("#courses_history_block").slideToggle(400); ', style:"color:#666666" if User.current.logged? %>
+	<%= link_to l(:label_course_done)+"("+@memberships_done.count.to_s+")", 'javascript:void(0);', :onclick => '$("#courses_history_block").slideToggle(400); ' if User.current.logged? %>
 	</p>
 
 	<div id="courses_history_block" class="courses_history hidden" >