directory browsing

Hi! I wan't to make directory browsing like yahoo or google over categories. For example look on http://www.google.com/dirhp I have made myself 2 diferent ways. One is quicker but more complex and oher is slower but easy to read and understand. In my table i have this colums id_cat, name, id_parent, level What i want to know is if anybody have done this and how. I want to know if i'm doing right way or is there another way. 1.) In my first way i fisrt select data from db with condition where id_parent='some_category'. Then i recursively run thru array of id_cat's which i have from previsious query. And get data for sub categories. This method is simple to program but it's slow on many categories. 2.) second way i use colum level to help get second query. First query is the same as on 1st example. In second query i select all categories which is one level lower than this i'm id. But then i have to program to delete all neceseary data from this array. This method was quicker but more complex. I hope this is understandable. I wan't to know how to code this. Is there maybe another way (better way) to solve this. Is maybe somewhere class for this. -- tia, Uros