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dhtmlx treeview onNodeSelect

tree.attachEvent("onClick",onNodeSelect)
//set function object to call on node select
//see other available event handlers in API documentation
function onNodeSelect(nodeId)
{
...
}

on above code I want to set another string as an argument to onNodeSelect function but unfortunately I can't.
because it's default argument - the first is current selected item id and the second is the previous selected item id.
when I set my argument as third an error occurred and say it is undefined.
could you please say to me how can I set my argument ?!

thank you very much

AMIR REZA RAHBARAN