function phptemplate_post_tabs() {
  $output = '';
  $i = 0;
  if ((arg(0))&&(arg(1))&&(arg(2))&&(arg(0)=='node')&&(arg(1)=='add')) {  
    $types = node_get_types();
   
    // og_content_type_admin has it's own mechanism of node accessing
    // so, if it's present, we have to take it into consideration
    if (module_exists('og_content_type_admin')) {
      $sql = "SELECT octa.types_active FROM {og_content_type_admin} octa WHERE octa.gid = -1";
      $holder = db_fetch_object(db_query($sql));
      $activated_types = unserialize($holder->types_active);
      foreach ($types as $key => $type){
        //this expression taken from og_content_type_admin, function og_content_type_admin_node_add()
        //we will remove nonalowed types from further process
        if (!(($activated_types[$type->type] != DEACTIVATED) || ($user->uid == 1))) {
            unset($types[$key]);
        }
      }
    }
   
    //next as usual
    foreach ($types as $type){
      if (function_exists($type->module .'_form') && node_access('create', $type->type)) {
        $output .= '<a class="create'.$type->type.(arg(2)==$type->type ?' active':'').'" href="'.base_path().drupal_get_path_alias('node/add/'.$type->type).'">'.t($type->name).'</a>';
        $i++;
      }
    }
    if (($output)&&($i>1))
      $output = '<div class="postlinks">'.$output.'</div>';
    else
      $output = '';
  }
  return ($output);
}

<?php print(theme('post_tabs')); ?>

postlinks{
margin:0px 0px 20px 0px;
}

.postlinks a{
margin:10px 20px 10px 0px;
padding:5px 8px;
line-height:20px;
}

.postlinks a.active{
background-color:#A6CEE7;
color:white;
}

a.createpost{padding:5px 10px 5px 23px;background:transparent url('images/page_add.gif') 3px 50% no-repeat;}
a.createslideshow{padding:5px 10px 5px 23px;background:transparent url('images/images.gif') 3px 50% no-repeat;}
a.createbuzz{padding:5px 10px 5px 23px;background:transparent url('images/comments.gif') 3px 50% no-repeat;}
a.createevent{padding:5px 10px 5px 23px;background:transparent url('images/event.gif') 3px 50% no-repeat;}
a.creategroup{padding:5px 10px 5px 23px;background:transparent url('images/group.gif') 3px 50% no-repeat;}
a.createpost.active{color:white;background:#A6CEE7 url('images/page_add.gif') 3px 50% no-repeat;}
a.createslideshow.active{color:white;background:#A6CEE7 url('images/images.gif') 3px 50% no-repeat;}
a.createbuzz.active{color:white;background:#A6CEE7 url('images/comments.gif') 3px 50% no-repeat;}
a.createevent.active{color:white;background:#A6CEE7 url('images/event.gif') 3px 50% no-repeat;}
a.creategroup.active{color:white;background:#A6CEE7 url('images/group.gif') 3px 50% no-repeat;}