$.fn.simpleTree = function(opt){
	return this.each(function(){
		var TREE = this;
		var ROOT = $('.root',this);
		var mousePressed = false;
		var mouseMoved = false;
		var ajaxCache = Array();

		TREE.option = {
			drag:		false,
			animate:	false,
			autoclose:	false,
			speed:		'fast',
			afterAjax:	false,
			afterMove:	false,
			afterClick:	false,
			afterDblClick:	false,
			afterContextMenu:	false,
			docToFolderConvert:false
		};
		TREE.option = $.extend(TREE.option,opt);
		$.extend(this, {getSelected: function(){
			return $('a.active', this).parent();
		}});
		TREE.closeNearby = function(obj)
		{
			$(obj).siblings().filter('.folder-open, .folder-open-last').each(function(){
				var childUl = $('>ul',this);
				var className = this.className;
				this.className = className.replace('open','close');
				if(TREE.option.animate)
				{
					childUl.animate({height:"toggle"},TREE.option.speed);
				}else{
					childUl.hide();
				}
			});
		};
		TREE.nodeToggle = function(obj)
		{
			var childUl = $('>ul',obj);
			if(childUl.is(':visible')){
				obj.className = obj.className.replace('open','close');

				if(TREE.option.animate)
				{
					childUl.animate({height:"toggle"},TREE.option.speed);
				}else{
					childUl.hide();
				}
			}else{
				obj.className = obj.className.replace('close','open');
				if(TREE.option.animate)
				{
					childUl.animate({height:"toggle"},TREE.option.speed, function(){
						if(TREE.option.autoclose)TREE.closeNearby(obj);
						if(childUl.is('.ajax'))TREE.setAjaxNodes(childUl, obj.id);
					});
				}else{
					childUl.show();
					if(TREE.option.autoclose)TREE.closeNearby(obj);
					if(childUl.is('.ajax'))TREE.setAjaxNodes(childUl, obj.id);
				}
			}
		};
		TREE.setAjaxNodes = function(node, parentId, callback)
		{
			if($.inArray(parentId,ajaxCache) == -1){
				ajaxCache[ajaxCache.length]=parentId;
				var url = $.trim($('>li', node).text());
				if(url && url.indexOf('url:'))
				{
					url=$.trim(url.replace(/.*\{url:(.*)\}/i ,'$1'));
					$.ajax({
						type: "POST",
						url: url,
						data: {'nothing' : "1"},
						contentType: 'html',
						cache: false,
						success: function(responce){
							node.removeAttr('class');
							node.html(responce);
							$.extend(node,{url:url});
							TREE.setTreeNodes(node, true);
							if(typeof TREE.option.afterAjax == 'function')
							{
								TREE.option.afterAjax(node);
							}
							if(typeof callback == 'function')
							{
								callback(node);
							}
						}
					});
				}
				
			}
		};
		TREE.setTreeNodes = function(obj, useParent){
			obj = useParent? obj.parent():obj;
			$('li>a', obj).addClass('text')
			.bind('selectstart', function() {
				return false;
			});
			$('li', obj).each(function(i){
				var className = this.className;
				var open = false;
				var cloneNode=false;
				var LI = this;
				var childNode = $('>ul',this);
				if(childNode.size()>0){
					var setClassName = 'folder-';
					if(className && className.indexOf('open')>=0){
						setClassName=setClassName+'open';
						open=true;
					}else{
						setClassName=setClassName+'close';
					}
					this.className = setClassName + ($(this).is(':last-child')? '-last':'');

					if(!open || className.indexOf('ajax')>=0)childNode.hide();

					TREE.setTrigger(this);
				}else{
					var setClassName = 'doc';
					this.className = setClassName + ($(this).is(':last-child')? '-last':'');
				}
			});
		};
		TREE.setTrigger = function(node){
			
			var trigger = $('>.trigger', node);
			trigger.click(function(event){
				TREE.nodeToggle(node);
			});
			if(!$.browser.msie)
			{
				trigger.css('float','left');
			}
		};
		

		TREE.addNode = function(id, text, callback)
		{
			var temp_node = $('<li><ul><li id="'+id+'"><a>'+text+'</a></li></ul></li>');
			TREE.setTreeNodes(temp_node);
			dragNode_destination = TREE.getSelected();
			dragNode_source = $('.doc-last',temp_node);
			TREE.moveNodeToFolder(dragNode_destination);
			temp_node.remove();
			if(typeof(callback) == 'function')
			{
				callback(dragNode_destination, dragNode_source);
			}
		};

		TREE.init = function(obj)
		{
			TREE.setTreeNodes(obj, false);
		};
		TREE.init(ROOT);
	});
}