Helper to embed flash content in a standards compliant, cross browser fashion. Uses the nested objects method (http://alistapart.com/articles/flashembedcagematch).

flash_helper.rb

module FlashHelper
  def embed_flash swf, options={}, &block
    outer_options = options.slice(:id, :width, :height).merge(:classid=>'clsid:D27CDB6E-AE6D-11cf-96B8-444553540000')
    inner_options = options.slice(:width, :height).merge(:type=>'application/x-shockwave-flash', :data=>swf)
    params = options[:params] && options[:params].map {|name, value| tag(:param, :name=>name, :value=>value)}.join || ''
    if block_given?
      embed_flash_with_block swf, outer_options, inner_options, params, &block
    else
      embed_flash_without_block swf, outer_options, inner_options, params
    end
  end
  
  private
  
  def embed_flash_with_block swf, outer_options, inner_options, params, &block
    markup = content_tag(:object, outer_options) do
      tag(:param, :name=>'movie', :value=>swf) +
      params +
      '<!--[if !IE]>-->' +
      content_tag(:object, inner_options) do
        params +
        '<!--<![endif]-->' +
        capture(&block) +
        '<!--[if !IE]>-->'
      end +
      '<!--<![endif]-->'
    end
    
    concat markup, block.binding
  end

  def embed_flash_without_block swf, outer_options, inner_options, params
    content_tag(:object, outer_options) do
      tag(:param, :name=>'movie', :value=>swf) +
      params +
      '<!--[if !IE]>-->' +
      content_tag(:object, params, inner_options) +
      '<!--<![endif]-->'
    end
  end
end