Attach a site-wide contact form to a node

attach-contact-form-to-node.php

<?php 
 //1. Open template.php in your theme folder and add the following code. Replace [THEME NAME] with the name of your theme. Replace the value of $nid with the actual ID of your node.
 /**
 * Implements preprocess_node().
 */
function mytheme_preprocess_node(&$vars) {
  // Print contact form on contact page.
  $nid = 7;
  if ($vars['node']->nid == $nid && module_exists('contact')) {
    module_load_include('inc', 'contact', 'contact.pages');
    $contact_form = drupal_get_form('contact_site_form');
    // We need to manually prepare our status messages. (Thanks, Rémy!)
    $contact_form['#prefix'] = theme('status_messages');
    $vars['contact_form'] = render($contact_form);
  }
}
 
//2. Open node.tpl.php in your theme folder (if you don't have it, copy it from your base theme or from modules/node). Add the following code to the spot where you would like the contact form to appear.
 if (!empty($contact_form)) {
  print $contact_form;
}