I wanted to remove the border in iframe (when opendocument url)

Hello

Recently, I customized the EIS system by using JSP langiuge

but, I had problem with the border in 'iFrame' Tag when opendocument url was used.

I executed the opendocument url in iFrame Tag. but iframe's border appeared.

I wanted to remove the border.  so,  I added frameboder =  'no' on attribute of the iframe.

but, border still remained.

** iframe tag**

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<iframe id="layout" frameborder="0" framespacing=0 marginheight=0 marginwidth=0 scrolling=no vspace=0  src = "<opendocument url>">

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I need your help. T . T