image_tag is it just plain Broken?

I'm trying

<%= link_to image_tag("#{gallery.link_to}"), gallery_path(gallery) unless gallery.thumbnail_id == 0%>

and get the error:

ActionView::TemplateError (undefined method `image_tag' for #<Gallery: 0xb7083be4>) on line #23 of app/views/users/index.rhtml

This is my definition of link_to def link_to     unless self.thumbnail_id == 0       picture = Picture.find(self.thumbnail_id)       path = picture.public_filename(:big_thumb)       return "#{path}"     else       return ""     end end

Any idea about that error?

Wait, I think I fixed it! Nevermind, XD

-Ryan