tree problem

hi,
i got problem regarding tree in PHP frankly speaking i never worked not i have to care about this tree…so please help me creating tree for this newbie

i created a login form in this i have login field and submit button name save
<—-userform.php
<form action=”useradmin.php” method=”post”>
<input name=”login” type=”text” size=”21″>

<input type=”submit” class=”biggray2″ value=” SAVE” name=”save”>
</form>

i created a New User Link on left frame that is pane.php from one admin tool and there i mention userform.php so i got a folder name New User on left

i want when user gives his login name and click on save he will get his name as New user’s sub directly exactly under New User and no matter how many users enter their name they will get their name under New User’s sub-directory something like on left frame#
–[U]New User[/U]
[U]andre[/U]
[U]peter[/U]
[U]so on[/U]

and when they click on their name on left frame let say andre
he will get userform.php in that page he can see the name but when click on New User he will get empty login field.

i just want to ask how i can write php in useradmin.php
please help em out as i dont no how to make tree for this or how to start…also one thing if he clicks on save this button will show some alert like u want to save if yes then tree else no

thanks in advance

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