fixed javascript error on Variant index. There was some Element.hide …

…and Element.show left behind. Replaced with jQuery call.

app/views/admin/variants/index.html.erb

@@ -57,8 +57,8 @@
       {:url => new_admin_product_variant_url(@product),
       :method => :get,
       :update => "variants",
-      :before => "Element.hide('new_var_link');Element.show('busy_indicator')",
-      :complete => "Element.hide('busy_indicator')"}, :class => 'iconlink' %>
+      :before => "$('#new_var_link').hide();$('#busy_indicator').show();",
+      :complete => "$('#busy_indicator').hide();"}, :class => 'iconlink' %>
   </span>&nbsp;|&nbsp;<%= link_to @deleted.blank? ? t("show_deleted") : t("show_active"), admin_product_variants_url(@product, :deleted =>  @deleted.blank? ? "on" : "off") %>
   </p>
   <%= image_tag "spinner.gif", :plugin=>"spree", :style => "display:none", :id => 'busy_indicator' %>