登录名不可修改要变成灰色

app/views/my/account.html.erb

@@ -30,7 +30,7 @@
           <li>&nbsp;&nbsp;</li>
         </ul>
         <ul class="setting_right ">
-          <li><%= f.text_field :login,:no_label=>true, :required => true, :nh_required=>"1",:disabled=>'disabled', :name => "login",:class=>"w210"%></li>
+          <li><%= f.text_field :login,:no_label=>true, :required => true,:style=>"color:grey", :nh_required=>"1",:disabled=>'disabled', :name => "login",:class=>"w210"%></li>
           <li><%= f.text_field :mail,:no_label=>true, :required => true,:nh_required=>"1",:class=>"w210"%></li>
 
           <li>