Customized node edit page How to customized the node edit page?
i was created one cart site for online education.
here i need one button to while edit the  node one of the content type?
how to create an button in node edit page?
how to add function for specific function for that button.
You can add a button to the node form, with a submit function for that button, using hook_form_alter()

function hook_form_alter(&amp;$form, &amp;$form_state, $form_id)
{
  $content_type = 'page'; // change as necessary
  if($form_id == $content_type . '_node_form')
  {
    $form['actions']['my_button'] = array
    (
      '#type' =&gt; 'submit',
      '#value' =&gt; t('Do something'),
      '#submit' =&gt; array('my_submit_function'),
    );
  }
}

function my_submit_function($form, &amp;$form_state)
{
  // Do stuff here
}