How to Combine Two Theme Override Functions in template.php?

I need to combine the following two theme override functions, but I'm not sure how to do so (I'm new to PHP). Any help is much appreciated.

Note that I'm using a subtheme in Zen, so my functions are mysubtheme_preprocess_ rather than _phptemplate_variables.

Thanks!

Function 1

//let HTML page title differ from node title using page_title module

function mysubtheme_preprocess_page($hook, $vars) {
        $vars = array();
        if ($hook == 'page') {
        if (module_exists('page_title')) {
        $vars['head_title'] = page_title_page_get_title();
       }
   }

return $vars;
}

Function 2

// use different page template suggestions based on node type

function mysubtheme_preprocess_page(&$vars) {
      if ($vars['node']) {
        $suggestions[] = 'page-nodetype-'. $vars['node']->type;
        // check to see if we're on the edit page
        $path = explode('/', $_GET['q']);
        if (!(arg(0) == 'node' && is_numeric(arg(1)) && arg(2) == 'edit')) {
            $vars['template_files'] = $suggestions;
      }
  }
  return $vars;
}