RE: [PHP] Foldable Checkbox lists

[snip] Newbie to PHP here. I have a list of categories, as checkboxes, that I would like a user to be able to choose from. There are literally hundreds of categories, however most of them are children categories. I obviously don't want to display all of the categories at once to the user as that would be unwieldy. What I would like is for the user to select the desired checkbox and then all the children categories would display. The categories are setup as follows: [/snip] CSS, DHTML and/or Javascript is what you would use here