# File lib/webby/helpers/capture_helper.rb, line 29
  def content_for( obj, string = nil, &block )
    return @_content_for[obj] unless string || block_given?

    cur = @_content_for[obj].to_s
    new = string.to_s + (block_given? ? capture_erb(&block) : "")
    @_content_for[obj] = cur + new
  end