<% if user.user_extensions && user.user_extensions.brief_introduction && !user.user_extensions.brief_introduction.empty? %>
    <%= user.user_extensions.brief_introduction %>&nbsp;
<% else%>
    这位童鞋很懒，什么也没有留下～&nbsp;
<% end %>
<% if User.current == user%>
    <%= link_to image_tag("../images/signature_edit.png",width:"12px", height: "12px"), "javascript:void(0);", :onclick => "show_edit_user_introduction();"%>
<% end%>