Collapsable Checkbox Hierarchy Tree

I want to make a form that has checkboxes of Categories and Sub Categories organized in a collapsable hierarchy tree where the clicked results can be inserted into a database. Is something like this possible to do with just PHP and MySQL? If so, can someone please point me in the direction of what I would need to learn to do this? I know how to make one that is all open, but since I'm going to have hundreds of Sub Categories, I really need to find a way to make this into a collapsable hierarchy tree. Any help would be greatly appreciated, thanks.

Below is an example of what I'd want the checkbox form to look like with all the fields exposed..

Category1
SubCategory1.1
SubCategory1.2
Category2
SubCategory2.1

But I want it closed until a main Category is clicked, so it would first look like this..

Category1
Category2

This site has something similar to what I want to achieve for another example...

http://dhtmlx.com/docs/products/dhtmlxTree/samples/checkboxes/pro_mixed_checkboxes.html

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