wordpress, display all child categories

 echo' <table border="0"><tr><td>';
 $counter=Display_catogories($t_parent," ",0,0);
 echo' </td></tr></table>';


 echo $t_content;
 $counter=0;
 function Display_catogories($t_parent,$title,$level){
 global $counter;
 $t_numer=1;
 //echo $t_parent.' ';
 $args = array(
 'orderby' => 'name',
 'hierarchical' => '1',
 'show_count'=>1,
 'child_of' =>$t_parent
 );
 $categories = get_categories( $args );
 foreach ( $categories as $category ) {
 if($category->parent==$t_parent){
 $counter++;
 echo $title.$t_numer.' <a href="' . get_category_link( $category->term_id ) . '">'. $category->name .'('.$category->count.')</a><br>';

 if(($counter%18)==0){ echo' </td><td>'; }
 Display_catogories($category->cat_ID,"..".$title.$t_numer."-",$level++);
 $t_numer++;

 }
 }

$categories =NULL;
 return $counter;
 }