Rails - Apr 2006 - text_field_with_auto_complete and special characters

I have a problem with text_field_with_auto_complete. Everything works 
fine except when I type special characters like ?,?,?. They are not 
escaped. "oberver_field" has a with-option like this:

:with => "''ort='' +
escape($F(''ort''))"

This works fine with umlauts, too. Is there a way to escape the user 
input using text_field_with_auto_complete ?

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