help me :)

Hello, i'm new in php but i have very difficult exercise.... i must make hierarchical menu witch can be released for example so : First i will get main menu : for example menu1, menu2, menu3... and these menu will have links (this must be released with <a href=""...) to others submenu : sub1, sub2, sub3 (each menu can have more than one sub menu), and these submenus will go deeper and deeper (depends from some parameters) so - the question is "How to make recursive menu ?" (menu mus be repaint after any click...) (I have an idea to make function that will "produce" recursive arrays...) P.S.sorry for poor english :) sincerely, Arvys.