non destructive thumbnail search incase this image is referenced more…

… than once on the same page

vendor/plugins/refinery/app/helpers/application_helper.rb

@@ -41,8 +41,8 @@ def selected_page?(page)
 
 	def image_fu(image, thumbnail, options={})
 		begin
-			image_to_use = thumbnail.nil? ? image : image.thumbnails.reject!{|t| t.thumbnail != thumbnail.to_s}.first
-			image_tag image_to_use.public_filename, {:width => image_to_use.width, :height => image_to_use.height}.merge!(options)
+			image = image.thumbnails.collect {|t| t if t.thumbnail == thumbnail.to_s}.compact.first unless thumbnail.nil?
+			image_tag image.public_filename, {:width => image.width, :height => image.height}.merge!(options)
 		rescue
 			image_tag image.public_filename(thumbnail), options
 		end