当鼠标移到新建课程/项目的图标按钮上时，给出相应的tip

app/views/layouts/new_base_user.html.erb

@@ -101,9 +101,9 @@
           <a href="javascript:void(0);" class="homepageMenuText" onclick="$('#homepageLeftMenuCourses').slideToggle();">课程</a>
           <% if is_current_user%>
               <% if User.current.user_extensions && User.current.user_extensions.identity == 0 && User.current.allowed_to?(:add_course, nil, :global => true)%>
-                  <%=link_to image_tag("../images/menu_setting.png",width:"14px", height: "14px",class: "homepageMenuSetting fr"), new_course_path%>
+                  <%=link_to image_tag("../images/menu_setting.png",width:"14px", height: "14px",class: "homepageMenuSetting fr",title: "新建课程"), new_course_path%>
               <% else%>
-                  <%=link_to image_tag("../images/menu_setting.png",width:"14px", height: "14px",class: "homepageMenuSetting fr"), join_private_courses_courses_path ,:remote => true%>
+                  <%=link_to image_tag("../images/menu_setting.png",width:"14px", height: "14px",class: "homepageMenuSetting fr", title:"加入课程"), join_private_courses_courses_path ,:remote => true%>
               <% end%>
           <% end%>
         </div>
@@ -117,7 +117,7 @@
           <a href="javascript:void(0);" class="homepageMenuText" onclick="$('#homepageLeftMenuForge').slideToggle();">项目</a>
 
           <% if is_current_user%>
-              <%=link_to image_tag("../images/menu_setting.png",width:"14px", height: "14px",class: "homepageMenuSetting fr"), new_project_path%>
+              <%=link_to image_tag("../images/menu_setting.png",width:"14px", height: "14px",class: "homepageMenuSetting fr",title:"新建项目"), new_project_path%>
           <% end%>
         </div>
         <div class="homepageLeftMenuCourses" id="homepageLeftMenuForge">