<?php $menu = wp_nav_menu( array('container' => '', 'container_class' => '', 'menu_class' => '', 'menu_id' => 'nav', 'echo'=> false, 'sort_column' => 'menu_order', 'theme_location' => 'primary' ) );
      /*  now we remove the <ul> at the beginning of the generated menu, we will append it manually together with a <li></li> that contains are home icon */
      $menu = substr($menu, 13);
      $menu = '<ul id="nav"><li class="home"><a href="'. get_option('home').'" rel="nofollow"><img src="'. get_bloginfo('stylesheet_directory') .'/images/men_icon_home.png" width="16" height="14" alt="" /></a></li>' . $menu;
      /*  now we remove the </ul> at the end of the generated menu, we will append it manually together with a <li class="cleaner">&nbsp;</li> that clears all floated elements */
      $menu_new = substr($menu, 0, -5);
      $menu_new .= '<li class="cleaner">&nbsp;</li></ul>';
      print_r($menu_new);
      ?>