What changes should i make in this code to add image for Add to cart button insted of default button?
$form['submit'] = array(
'#type' => 'submit',
'#value' => variable_get('uc_product_add_to_cart_text', t('Add to cart')),
'#id' => 'edit-submit-'. $node->nid,
'#attributes' => array(
'class' => 'node-add-to-cart',
),
);
return $form;
}