link_to_function image swapper

link_to_function((image_tag image.file.url(:thumb)), project, image, :id => "project_main_image_anchor") do |page|
      page[:main_image_wrapper].replace_html ('<a href="' + image.file.url(:original) + '" id="project_main_image_anchor" title="' + project.title + '" rel="shadowbox">' + (image_tag image.file.url(:medium), :title => "Click to enlarge.") + '</a>')
end