Use #image_tag for dashboard tabs throbber.

app/views/dashboard/_menu.html.haml

@@ -2,7 +2,7 @@
   = link_to "Activities", dashboard_path, :remote => true, :class => "button-small dash-button #{"active" if current_page?(dashboard_path) || current_page?(root_path) }", :id => "activities_slide"
   = link_to "Issues", dashboard_issues_path, :remote => true, :class => "button-small dash-button #{"active" if current_page?(dashboard_issues_path)}", :id => "issues_slide"
   = link_to "Merge Requests", dashboard_merge_requests_path, :remote => true, :class => "button-small dash-button #{"active" if current_page?(dashboard_merge_requests_path)}", :id => "merge_requests_slide"
-  %img{:src => "/assets/ajax-loader-facebook.gif", :class => "dashboard-loader"}
+  = image_tag "ajax-loader-facebook.gif", :class => "dashboard-loader"
 
 :javascript 
   $(function(){