Thanks for your hints!
In this case Firebug didn't throw any error.
Sp I replaced:
<% form_tag '/trees' do -%>
<%= submit_to_remote 'new_tree', 'Add a tree', :url => { :controller
=> 'trees', :action => 'new' } %>
<% end -%>
By:
<%= button_to_function 'Add a tree' do |page| page.replace_html
'newtree', :partial => 'user/trees/newtree' end %>
...and it works fine! Thanks!
Tom
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