diff --git a/app/views/code_review_settings/_filters.html.erb b/app/views/code_review_settings/_filters.html.erb
index a5ebbf0..fedceb0 100644
--- a/app/views/code_review_settings/_filters.html.erb
+++ b/app/views/code_review_settings/_filters.html.erb
@@ -63,10 +63,10 @@
 
               -%>
               <%=
-              link_to(image_tag('2uparrow.png',  :alt => l(:label_sort_highest)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'highest')", :title => l(:label_sort_highest)) +
-                link_to(image_tag('1uparrow.png',   :alt => l(:label_sort_higher)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'higher')", :title => l(:label_sort_higher)) +
-                link_to(image_tag('1downarrow.png', :alt => l(:label_sort_lower)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'lower')", :title => l(:label_sort_lower)) +
-                link_to(image_tag('2downarrow.png', :alt => l(:label_sort_lowest)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'lowest')", :title => l(:label_sort_lowest))
+              link_to(image_tag('2uparrow.png',  :plugin => 'redmine_code_review', :alt => l(:label_sort_highest)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'highest')", :title => l(:label_sort_highest)) +
+                link_to(image_tag('1uparrow.png',   :plugin => 'redmine_code_review', :alt => l(:label_sort_higher)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'higher')", :title => l(:label_sort_higher)) +
+                link_to(image_tag('1downarrow.png', :plugin => 'redmine_code_review', :alt => l(:label_sort_lower)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'lower')", :title => l(:label_sort_lower)) +
+                link_to(image_tag('2downarrow.png', :plugin => 'redmine_code_review', :alt => l(:label_sort_lowest)), '#', :onclick => "cr_sort_filter('#{sorturl}', 'lowest')", :title => l(:label_sort_lowest))
               -%>
 
             </td>
diff --git a/assets/images/1downarrow.png b/assets/images/1downarrow.png
new file mode 100644
index 0000000..a6d07e9
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diff --git a/assets/images/1uparrow.png b/assets/images/1uparrow.png
new file mode 100644
index 0000000..6c0eae4
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diff --git a/assets/images/2downarrow.png b/assets/images/2downarrow.png
new file mode 100644
index 0000000..1796516
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diff --git a/assets/images/2uparrow.png b/assets/images/2uparrow.png
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index 0000000..352cc2b
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