drupal 7 create tpl.php file

first insert below code in template.php file

function garland_preprocess_page(&$vars) {

  if(arg(1) == 17){
    $vars['theme_hook_suggestions'][] = "page__homepage";
  }


and create page--homepage.tpl.php file

then it will work and give if condition node 17 and please change on which page you want to show here