link_to_action with confirmation

link_to_action with confirmation.rb

# create a link to an action. A confirm box will pop up before 
# you can process to action specified here.
# link_to_action "Delete", "Are you sure?", :method => 'delete', 
#  :class => "negative", :controller => 'price_letters', 
#  :action => 'destroy', :id => letter.id
# link_to_action "Effect Now", "Take effect now, and can not be reversed?",
#  :controller => "price_letters", :action => 'effect_now', :id => letter.id
def link_to_action(link_text, msg = "Are you sure", attributes = {})
  content = (msg || "Are you sure?")
  attrs = { :method => 'post' }
  attrs = attrs.merge(attributes)
  %{<a href="/#{attrs[:controller]}/#{attrs[:action]}/#{attrs[:id]}" 
      onclick="if (confirm('#{content}')) 
      {
        var f = document.createElement('form'); 
        f.style.display = 'none'; 
        this.parentNode.appendChild(f); 
        f.method = 'POST'; 
        f.action = this.href;
        var m = document.createElement('input'); 
        m.setAttribute('type', 'hidden'); 
        m.setAttribute('name', '_method');
        m.setAttribute('value', '#{attrs[:method]}'); 
        f.appendChild(m);f.submit();
     }
     return false;" class="#{attrs[:class]}">#{link_text}</a>}     
end