# File lib/action_view/helpers/asset_tag_helper.rb, line 451 def image_tag(source, options = {}) options.symbolize_keys! options[:src] = path_to_image(source) options[:alt] ||= File.basename(options[:src], '.*').split('.').first.to_s.capitalize if size = options.delete(:size) options[:width], options[:height] = size.split("x") if size =~ %r{^\d+x\d+$} end if mouseover = options.delete(:mouseover) options[:onmouseover] = "this.src='#{image_path(mouseover)}'" options[:onmouseout] = "this.src='#{image_path(options[:src])}'" end tag("img", options) end