Wordpress two level sidebar

sidebar.php

			<?php
				$sidebar = false;
				$subpages = get_posts(array('post_type'=>'page', 'post_parent'=>$post->ID));
				if( count($subpages) > 0 ){	
					foreach( $subpages as $sp ){

						if( $sp->ID == $post->ID ){
							$sidebar .= '<div><a class="active" href="'.$sp->guid.'">'.$sp->post_title.'</a></div>';
						} else {
							$sidebar .= '<div><a href="'.$sp->guid.'">'.$sp->post_title.'</a></div>';
						}

						
					}
				} else {
					if( $post->post_parent != 0 ){
						$subpages = get_posts(array('post_type'=>'page', 'post_parent'=>$post->post_parent));
						if( count($subpages) > 0 ){	
							foreach( $subpages as $sp ){
								if( $sp->ID == $post->ID ){
									$sidebar .= '<div><a class="active" href="'.$sp->guid.'">'.$sp->post_title.'</a></div>';
								} else {
									$sidebar .= '<div><a href="'.$sp->guid.'">'.$sp->post_title.'</a></div>';
								}
							}
						}
					}
				}
				echo ($sidebar)?$sidebar:''; // if exists
			?>