Printing out in columns?

YAHOO.example.treeExample = function() {
	function buildTree() {
		//create a new tree:
		tree = new YAHOO.widget.TreeView("treeDiv1");
		
		//get root node for tree:
		var root = tree.getRoot();
		
		//create dummy data for root
		var mainCategories = new Array();
		mainCategories[0] = "Category A";
		mainCategories[1] = "Category B";
		mainCategories[2] = "Category C";
		mainCategories[3] = "Category D";
		mainCategories[4] = "Category E";
		mainCategories[5] = "Category F";
		
		for (i=0;i<mainCategories.length;i++)
		{
			var tmpNode = new YAHOO.widget.TextNode({label: mainCategories[i], customData: mainCategories[i] + "-metadata"}, root, false);			
			//set dynamic loading just for these top-level nodes
			tmpNode.setDynamicLoad(loadNodeData);
		}
		tree.draw();
	}
 
	//handler to process label clicks, to be
	//assigned in our dynamic load function
	var onLabelClick = function(oNode) {
		document.getElementById("report").innerHTML = "The node you clicked on had the label '" + oNode.data.label  + "'";
	}
 
	function loadNodeData(node, fnLoadComplete) {
		//dummy data for bmw parent
		var oSubCategory = {
			"Category A":["1","2","3"],
			"Category B":["1","2","3"],
			"Category C":["1","2","3"],
			"Category D":["1","2","3"],
			"Category E":["1","2","3"],
			"Category F":["1","2","3"]
			};
		
		//get the models for the car make designated
		//by the clicked label
		var children = oSubCategory[node.data.label];
		
		//loop through children array	
		for (var i=0; i<children.length; i++) {
			thisModel = children[i];
			var newNode = new YAHOO.widget.TextNode({label:thisModel}, node, false);
			newNode.onLabelClick = onLabelClick;
		}
		fnLoadComplete();
	}
	return {
		init: function() {
			buildTree();
		}
	}
}()
YAHOO.util.Event.addListener(window, "load", YAHOO.example.treeExample.init, YAHOO.example.treeExample, true);