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how to pass tree object to function call?

If I have 2 dhtml Tree in a single page,how can I retrieve the tree object in javascript function call?
As I tried to get the treeObject with the following statements, the object return is not a tree object. All dhtmlTree's function call are not valid.

function isValidMove(treeObj) {
treeX = document.getElementById(treeObj.id); // treeObj is the DIV id
alert(treeObj.id + ":" + treeX.getSelectedItemId()); // treeX is not an dhtmlTree object, is just a DIV
}

How can I pass/get the dhtmlTree object in a function? especially in the case that I have 2 trees in a single page?
I do not want to hardcode the tree object with tree1, tree2, tree3, ... and so on ...

Thanks in advance.

Inside any event handler you can use this as pointer to related object

mytree.attachEvent("onClick",function(id){
    alert(this.getSelectedItemId());
});

There is  no way to retrieve tree object from ID of tree container.