extract function for toggling email footer and header

app/helpers/application_helper.rb

@@ -923,7 +923,7 @@ module ApplicationHelper
   def switch_emails_decorators_language(lang)
     localized_language_name = l(:general_lang_name, :locale => lang)
     # make that better
-    link_to_function(localized_language_name, "jQuery('#emails_decorators a').css('text-decoration', 'none'); jQuery(this).css('text-decoration', 'underline');  jQuery('.emails_decorators').hide(); jQuery('#emails_decorators_#{lang}').show();")
+    link_to_function(localized_language_name, "toggleEmailDecoratorFields(this, '#{lang}')")
   end
 
   def progress_bar(pcts, options={})

public/javascripts/application.js

@@ -459,6 +459,14 @@ function addClickEventToAllErrorMessages() {
     });
   });
 }
+
+function toggleEmailDecoratorFields(sender, lang) {
+  jQuery("#emails_decorators a").css("text-decoration", "none");
+  jQuery(".emails_decorators").hide();
+  jQuery(sender).css("text-decoration", "underline");
+  jQuery("#emails_decorators_" + lang).show();
+}
+
 $(document).observe('dom:loaded', function() {
   // Set focus on first error message
   var error_focus = $$('a.afocus').first();