[Rails] form_tag and button_to bug?

Hi,everyone:
I use form_tag create a form and nested a button_to tag like this:
<%= form_tag(orders_path) do %>
......... #some form fields
<%=button_to "remove",line_item, :method=>:delete
%>
<%= submit_tag "Checkout" %>
<% end %>

when I click "Checkout" ,the form always invokes "remove" method!
How can I solve this problem? Thanks!

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