I've ran into a ror problem using the link_to. Why does my link to use the GET method and my button_to use the POST method, after I specified my "method"=>"post" within the link_to parameters?

View:

<%= button_to "pdf", :action => 'getquote' %>
<%= link_to 'pdf', {:controller => 'inventories', :action => 'getquote', :method => :post } %>

Controller Method:

def getquote
@cart = find_cart
respond_to do |format|
format.pdf
end
end

Terminal Output (Button/Link, respectively):

Processing InventoriesController#getquote (for 127.0.0.1 at 2010-01-30 01:38:02) [POST]
  Parameters: {"action"=>"getquote", "authenticity_token"=>"D2cwnHyTHgomdUM3wXBBXlOe4NQLmv1Srn0paLbExpQ=", "controller"=>"inventories"}

Processing InventoriesController#show (for 127.0.0.1 at 2010-01-30 01:39:07) [GET]
  Parameters: {"method"=>"post", "action"=>"show", "id"=>"getquote", "controller"=>"inventories"}