specify image dimensions for pictures in the guides credits page

railties/guides/rails_guides/helpers.rb

@@ -15,7 +15,7 @@ def guide(name, url, options = {}, &block)
     def author(name, nick, image = 'credits_pic_blank.gif', &block)
       image = "images/#{image}"
 
-      result = content_tag(:img, nil, :src => image, :class => 'left pic', :alt => name)
+      result = content_tag(:img, nil, :src => image, :class => 'left pic', :alt => name, :width => 91, :height => 91)
       result << content_tag(:h3, name)
       result << content_tag(:p, capture(&block))
       content_tag(:div, result, :class => 'clearfix', :id => nick)