Using link_to_remote/remote_function outside of a Controller

Hello!
I have a problem that is quite anoying!

In side my Controller it is no problem to use the
link_to_remote/remote_function function to produce html stuff to include
in my .rhtml file. BUT if I want to do this in another object, for
eample if I inside my controller (init_test) want to do like this:

my_dropdown->get_html

in which I want to perform the link_to_remote/remote_function function
and then return the html it produces it fails. I get the following error
message:

################################################################
NoMethodError in Init_test#index

undefined method `url_for’ for #Dropdown:0xe431a8

RAILS_ROOT: .
Application Trace | Framework Trace | Full Trace

#{RAILS_ROOT}bla/bla/…/Ruby/lib/ruby/gems/1.8/gems/actionpack-1.10.2/lib/action_view/helpers/javascript_helper.rb:279:in
remote_function' #{RAILS_ROOT}/app/controllers/dropdown.rb:24:inget_html’
#{RAILS_ROOT}/app/controllers/init_test_controller.rb:26:in index' #{RAILS_ROOT}/app/controllers/init_test_controller.rb:16:inindex’

################################################################

and the call looks like this:
################################################################
#I uses remote_function within a select_tag funtion call:
remote_function(:update => values_id,
:with => “val=+value”,
:url => {:action => :update_blocks }))

################################################################

There might be a logical explanation to this behaviour but I cant figure
it out! Any help is appreciated!

/Rick