php - how to place an image instaed of a button in zendframework project -

i have send framework project. here have form contain code button see

'signup' => array('submit', array(             'decorators' => $buttondecorators,             'label' => 'next',             'required' => false,             'ignore'   => true,         ))     ) 

i need place image instead of submit button. don't know how?

does know this?

thanks in advance......

i think need write 'image' instead 'submit';

'signup' => array('image', array(             'decorators' => $buttondecorators,             'label' => 'next',             'required' => false,             'ignore'   => true,         ))     ) 

try this.i have not used zend framwork yet. may helpful you...

thanks.