CodeThatTree - Property onopen, onclose

<script language="javascript1.2">
<!--

var TreeDef = {
	"style" :
	{
		"imgitem" : "tree/img/item.gif", // Image for leafs
		"imgdir" : "tree/img/open2.gif", // Image for directories
		"imgdiropen" : "tree/img/close2.gif", // Image for directories in open state
		"itemoffset" : {
			"x" : "10", "y" : "0"
		}, // Offset for a next tree level
		"css" : "test2tree",
		"color" : "#00008B",
		"fixwidth" : 200
	},
	"position" : {
		"absolute" : true, "pos" : [10, 15]
	},
	"styleover" : {
		"bgcolor" : "#D3E5FA", "css" : "test2tree", "color" : "#00008B"
	},
	// Main items array. In this case has one item Item1
	"items" : [
	{
		"text" : "Item1", "id" : "Id1",
		"onopen" : "window.alert('Item 1 is opened!')",
		"onclose" : "window.alert('Item 1 is closed!')",
		// Subtree definition
		"menu" :
		{
			// Subitems array.
			"items" : [ {
				"text" : "Item11"
			},
			{
				"text" : "Item12"
			},
			{
				"text" : "Item13"
			} ]
		}
	},
	{
		"text" : "Item2",
		"onopen" : "window.alert('Item 2 is opened!')",
		"onclose" : "window.alert('Item 2 is closed!')",
		// Subtree definition
		"menu" :
		{
			"style" : {
				"imgitem" : "tree/img/item2.gif"
			},
			"items" : [ {
				"text" : "Item21"
			},
			{
				"text" : "Item22"
			},
			{
				"text" : "Item23"
			} ]
		}
	} ]
};

var t1 = new CTree(TreeDef, "sample");
t1.create();
t1.draw(); 

//-->
</script>