collapsible Force directed graph

[Vaishnavi Guduguntla]

 Hi guys,

I am trying to do a project in d3 using collapsible force directed graph.The problem i am facing are:

1)I want the graph to be closed when loaded first.

2) i want to add and remove images on a node click

could any one help me with this i am stuck here and not able to bush my project more further

Thanks,

Vaishnavi