php - Hide thumbnail of Backend file uploader in Magento? -

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i using magento's default file uploader in custom modules. how can hide image thumbnail shown in image below?

enter image description here

in form.php of custom extention change second argument image file

before

   $fieldset->addfield('before_image', 'image', array(               'label'     => mage::helper('testimonials')->__('before image'),               'required'  => false,               'name'      => 'before_image',           ));

after

 $fieldset->addfield('before_image', 'file', array(           'label'     => mage::helper('testimonials')->__('before image'),           'required'  => false,           'name'      => 'before_image',       ));

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