var opened = new Array;
			
			function open_tree_node(link_container_id,area_id,layer_name,level) {
				var el = document.getElementById(layer_name);
				level++;
				
				if (opened[area_id] == true) {
					opened[area_id] = false;
					display_none(layer_name);	
				}
				else {
					var url = 'tree.dsp?area_id='+area_id+'&layer_name='+layer_name+'&level='+level;
				    ajax_obj.open("POST", url, true);
					ajax_obj.onreadystatechange = open_tree_node_resp;
					ajax_obj.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
					ajax_obj.send(null);	
					opened[area_id] = true;
				}		
			}
			
			function open_tree_node_resp() {
				if (ajax_obj.readyState == 4) {
					if (ajax_obj.status == 200) {
					    var response = ajax_obj.responseText;
					    var fields = response.split(";");
					    var layer_name = fields.shift();
					    response = fields.join(";");
					    var wnd = document.getElementById(layer_name);
					    wnd.innerHTML = response;
					    display_block(layer_name);
					} 
				}		
			}
		
			function select_tree_node(type,id) {
				if ( type == 1 ) {
				
				}
				else if (type == 0 ) {
					
				}	
			}