I've jQuery just a few times and am hoping there's a component which functions as you can see in the screenshots below - click the '+' to expand the sub-topics, click '-' to collapse them, etc. Can anyone point me to such a component, please; or is there some plain HTML and CSS solution I could use? I've looked at these possibilities but they seem over-engineered for my simple needs:

http://philogb.github.io/jit/demos.html

http://jsplumbtoolkit.com/jquery/demo.html

http://kenneth.kufluk.com/google/js-mindmap/