Ext.BLANK_IMAGE_URL = '/ext/resources/images/default/s.gif';

Ext.onReady(function() { 
	var tree = new Ext.tree.TreePanel("tree_div", {
	   	animate:true, 
	   	containerScroll:true, 
	   	rootVisible:true,
		loader: new Ext.tree.TreeLoader({dataUrl:"/ajax_intro/tree_children.php"}),
	    lines:true
	});
			    
	var root = new Ext.tree.AsyncTreeNode({
	    text: "Tree"
	});
		
	tree.setRootNode(root);
	tree.render();
	
	root.expand()
	
})