[Rails] :confirm dont work

hi
i have a link in a view to delete a user:
<td><%= link_to 'Destroy', {:controller => :users, :action
=> :destroy, :id => user}, :confirm => 'are you sure !' %></td>

all works good,when i click to delete user its ok, just i dont have
the alert 'are you sure !'

i dont know why!
please can you help me.
thanks

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