newbie needs advise: from prawnto to htmldoc (googlemaps)

hi, i used to utilize prawnto, but due limitations i went on to
htmldoc. basic problem (i hope):

this was working code in prawnto:

h = Hash.new
h[:pic_google_map]="http://maps.google.com/maps/api/staticmap?
center=#{@address.lat},#{@address.lng}
&zoom=12&size=400x400&sensor=false"
pdf.image open(h[:pic_google_map]) , :position => :center

now im trying this similar in htmldoc, but it always gives me an
argumet-count error:

h = Hash.new
h[:pic_google_map]="http://maps.google.com/maps/api/staticmap?
center=#{@address.lat},#{@address.lng}
&zoom=12&size=400x400&sensor=false"
<%= pdf_image_tag2(h) %>

def pdf_image_tag2(image, options = {})
  options[:src] =
open(image[:pic_google_map])#File.expand_path(RAILS_ROOT) + '/public/
images/' + image
  tag(:img, options)
end

pls help

thx