Advice about a menu/dropdown control

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ASP.NET

Hi

I need advice on a control I want to implement in my page.

Please see the link

http://www.waterfordcity.ie/maps/maps.htm

Believe me it is not a spam or harmful link.

There is a tree under show map section at the left side. I want to exactly implement it in my page as it suits our need- clicking on each node opens it and clicking on each sub node shows associated image just beside the node and also does some operation in the map. When some other parent node is clicked and opened the previous parent node is closed

If you do not intend to visit the url then I try to explain here..

Control is as follows

parent1
parent2
parent3

after parent1 is clicked

parent1
<space>subnode1
<space>subnode2
parent2
parent3

when subnode1 is clicked
parent1
<space><img>subnode1
<space>subnode2
parent2
parent3

when subnode1 is clicked
parent1
<space>subnode1
<space><img>subnode2
parent2
parent3


When parent2 is clicked, parent2 is opened and parent1 is closed.
parent1
parent2
<space>subnode1
<space>subnode2
parent3



I am not sure how to build such a control.

Can anyone advice please?

Thanks

Vijay