widgEditor not showing on edit page?

I implemented widgEditor for a text_area,

I use

<%= text_area ‘post’, ‘description’, ‘class’=>‘widgEditor’ %>

to offer a basic textarea allowing users to enter text.

it shows when creating a new record, but not shows when a user clicks
edit page. the edit pages just shows a plain text_area.

all rhtml pages are generated by rails.

I compared new and edit page, both codes are same, no idea what

I am under IE6.

Thanks for any help. regards,