//liuyang
// Node object

function Node(id, pid, name, url, title, target, icon, iconOpen, open) {

	this.id = id;

	this.pid = pid;

	this.name = name;

	this.url = url;

	this.title = title;

	this.target = target;

	this.icon = icon;

	this.iconOpen = iconOpen;

	this._io = open || false;

	this._is = false;

	this._ls = false;

	this._hc = false;

	this._ai = 0;

	this._p;

};

// Tree object

function dTree(objName) {

	this.config = {

		target : null,

		folderLinks : true,

		useSelection : true,

		useCookies : true,

		useLines : true,

		useIcons : true,

		useStatusText : false,

		closeSameLevel : false,

		inOrder : false

	}

	this.icon = {

		root : '../images/tree/base.gif',

		folder : '../images/tree/folder.gif',

		folderOpen : '../images/tree/folderopen.gif',

		node : '../images/tree/page.gif',

		empty : '../images/tree/empty.gif',

		line : '../images/tree/line.gif',

		join : '../images/tree/join.gif',

		joinBottom : '../images/tree/joinbottom.gif',

		plus : '../images/tree/plus.gif',

		plusBottom : '../images/tree/plusbottom.gif',

		minus : '../images/tree/minus.gif',

		minusBottom : '../images/tree/minusbottom.gif',

		nlPlus : '../images/tree/nolines_plus.gif',

		nlMinus : '../images/tree/nolines_minus.gif'

	};

	this.obj = objName;

	this.aNodes = [];

	this.aIndent = [];

	this.root = new Node(-1);

	this.selectedNode = null;

	this.selectedFound = false;

	this.completed = false;

};

// Adds a new node to the node array

dTree.prototype.add = function(id, pid, name, url, title, target, icon,
		iconOpen, open) {

	this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title,
			target, icon, iconOpen, open);

};

// Open/close all nodes

dTree.prototype.openAll = function() {

	this.oAll(true);

};

dTree.prototype.closeAll = function() {

	this.oAll(false);

};

// Outputs the tree to the page

dTree.prototype.toString = function() {

	var str = '<div class="dtree">\n';

	if (document.getElementById) {

		if (this.config.useCookies)
			this.selectedNode = this.getSelected();

		str += this.addNode(this.root);

	} else
		str += 'Browser not supported.';

	str += '</div>';

	if (!this.selectedFound)
		this.selectedNode = null;

	this.completed = true;

	return str;

};

// Creates the tree structure

dTree.prototype.addNode = function(pNode) {

	var str = '';

	var n = 0;

	if (this.config.inOrder)
		n = pNode._ai;

	for (n; n < this.aNodes.length; n++) {

		if (this.aNodes[n].pid == pNode.id) {

			var cn = this.aNodes[n];

			cn._p = pNode;

			cn._ai = n;

			this.setCS(cn);

			if (!cn.target && this.config.target)
				cn.target = this.config.target;

			if (cn._hc && !cn._io && this.config.useCookies)
				cn._io = this.isOpen(cn.id);

			if (!this.config.folderLinks && cn._hc)
				cn.url = null;

			if (this.config.useSelection && cn.id == this.selectedNode
					&& !this.selectedFound) {

				cn._is = true;

				this.selectedNode = n;

				this.selectedFound = true;

			}

			str += this.node(cn, n);

			if (cn._ls)
				break;

		}

	}

	return str;

};

// Creates the node icon, url and text

dTree.prototype.node = function(node, nodeId) {

	var str = '<div class="dTreeNode">' + this.indent(node, nodeId);

	if (this.config.useIcons) {

		if (!node.icon)
			node.icon = (this.root.id == node.pid) ? this.icon.root
					: ((node._hc) ? this.icon.folder : this.icon.node);

		if (!node.iconOpen)
			node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;

		if (this.root.id == node.pid) {

			node.icon = this.icon.root;

			node.iconOpen = this.icon.root;

		}

		str += '<img id="i' + this.obj + nodeId + '" src="'
				+ ((node._io) ? node.iconOpen : node.icon) + '" alt="" />';

	}

	if (node.url) {

		str += '<a id="s'
				+ this.obj
				+ nodeId
				+ '" class="'
				+ ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node'))
						: 'node') + '" href="' + node.url + '"';

		if (node.title)
			str += ' title="' + node.title + '"';

		if (node.target)
			str += ' target="' + node.target + '"';

		if (this.config.useStatusText)
			str += ' onmouseover="window.status=\''
					+ node.name
					+ '\';return true;" onmouseout="window.status=\'\';return true;" ';

		if (this.config.useSelection
				&& ((node._hc && this.config.folderLinks) || !node._hc))

			str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ');"';

		str += '>';

	}

	else if ((!this.config.folderLinks || !node.url) && node._hc
			&& node.pid != this.root.id)

		str += '<a href="javascript: ' + this.obj + '.o(' + nodeId
				+ ');" class="node">';

	str += node.name;

	if (node.url || ((!this.config.folderLinks || !node.url) && node._hc))
		str += '</a>';

	str += '</div>';

	if (node._hc) {

		str += '<div id="d' + this.obj + nodeId
				+ '" class="clip" style="display:'
				+ ((this.root.id == node.pid || node._io) ? 'block' : 'none')
				+ ';">';

		str += this.addNode(node);

		str += '</div>';

	}

	this.aIndent.pop();

	return str;

};

// Adds the empty and line icons

dTree.prototype.indent = function(node, nodeId) {

	var str = '';

	if (this.root.id != node.pid) {

		for (var n = 0; n < this.aIndent.length; n++)

			str += '<img src="'
					+ ((this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line
							: this.icon.empty) + '" alt="" />';

		(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);

		if (node._hc) {

			str += '<a href="javascript: ' + this.obj + '.o(' + nodeId
					+ ');"><img id="j' + this.obj + nodeId + '" src="';

			if (!this.config.useLines)
				str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;

			else
				str += ((node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom
						: this.icon.minus)
						: ((node._ls && this.config.useLines) ? this.icon.plusBottom
								: this.icon.plus));

			str += '" alt="" /></a>';

		} else
			str += '<img src="'
					+ ((this.config.useLines) ? ((node._ls) ? this.icon.joinBottom
							: this.icon.join)
							: this.icon.empty) + '" alt="" />';

	}

	return str;

};

// Checks if a node has any children and if it is the last sibling

dTree.prototype.setCS = function(node) {

	var lastId;

	for (var n = 0; n < this.aNodes.length; n++) {

		if (this.aNodes[n].pid == node.id)
			node._hc = true;

		if (this.aNodes[n].pid == node.pid)
			lastId = this.aNodes[n].id;

	}

	if (lastId == node.id)
		node._ls = true;

};

// Returns the selected node

dTree.prototype.getSelected = function() {

	var sn = this.getCookie('cs' + this.obj);

	return (sn) ? sn : null;

};

// Highlights the selected node

dTree.prototype.s = function(id) {

	if (!this.config.useSelection)
		return;

	var cn = this.aNodes[id];

	if (cn._hc && !this.config.folderLinks)
		return;

	if (this.selectedNode != id) {

		if (this.selectedNode || this.selectedNode == 0) {

			eOld = document.getElementById("s" + this.obj + this.selectedNode);

			eOld.className = "node";

		}

		eNew = document.getElementById("s" + this.obj + id);

		eNew.className = "nodeSel";

		this.selectedNode = id;

		if (this.config.useCookies)
			this.setCookie('cs' + this.obj, cn.id);

	}

};

// Toggle Open or close

dTree.prototype.o = function(id) {

	var cn = this.aNodes[id];

	this.nodeStatus(!cn._io, id, cn._ls);

	cn._io = !cn._io;

	if (this.config.closeSameLevel)
		this.closeLevel(cn);

	if (this.config.useCookies)
		this.updateCookie();

};

// Open or close all nodes

dTree.prototype.oAll = function(status) {

	for (var n = 0; n < this.aNodes.length; n++) {

		if (this.aNodes[n]._hc && this.aNodes[n].pid != this.root.id) {

			this.nodeStatus(status, n, this.aNodes[n]._ls)

			this.aNodes[n]._io = status;

		}

	}

	if (this.config.useCookies)
		this.updateCookie();

};

// Opens the tree to a specific node

dTree.prototype.openTo = function(nId, bSelect, bFirst) {

	if (!bFirst) {

		for (var n = 0; n < this.aNodes.length; n++) {

			if (this.aNodes[n].id == nId) {

				nId = n;

				break;

			}

		}

	}

	var cn = this.aNodes[nId];

	if (cn.pid == this.root.id || !cn._p)
		return;

	cn._io = true;

	cn._is = bSelect;

	if (this.completed && cn._hc)
		this.nodeStatus(true, cn._ai, cn._ls);

	if (this.completed && bSelect)
		this.s(cn._ai);

	else if (bSelect)
		this._sn = cn._ai;

	this.openTo(cn._p._ai, false, true);

};

// Closes all nodes on the same level as certain node

dTree.prototype.closeLevel = function(node) {

	for (var n = 0; n < this.aNodes.length; n++) {

		if (this.aNodes[n].pid == node.pid && this.aNodes[n].id != node.id
				&& this.aNodes[n]._hc) {

			this.nodeStatus(false, n, this.aNodes[n]._ls);

			this.aNodes[n]._io = false;

			this.closeAllChildren(this.aNodes[n]);

		}

	}

}

// Closes all children of a node

dTree.prototype.closeAllChildren = function(node) {

	for (var n = 0; n < this.aNodes.length; n++) {

		if (this.aNodes[n].pid == node.id && this.aNodes[n]._hc) {

			if (this.aNodes[n]._io)
				this.nodeStatus(false, n, this.aNodes[n]._ls);

			this.aNodes[n]._io = false;

			this.closeAllChildren(this.aNodes[n]);

		}

	}

}

// Change the status of a node(open or closed)

dTree.prototype.nodeStatus = function(status, id, bottom) {

	eDiv = document.getElementById('d' + this.obj + id);

	eJoin = document.getElementById('j' + this.obj + id);

	if (this.config.useIcons) {

		eIcon = document.getElementById('i' + this.obj + id);

		eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;

	}

	eJoin.src = (this.config.useLines) ?

	((status) ? ((bottom) ? this.icon.minusBottom : this.icon.minus)
			: ((bottom) ? this.icon.plusBottom : this.icon.plus)) :

	((status) ? this.icon.nlMinus : this.icon.nlPlus);

	eDiv.style.display = (status) ? 'block' : 'none';

};

// [Cookie] Clears a cookie

dTree.prototype.clearCookie = function() {

	var now = new Date();

	var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24);

	this.setCookie('co' + this.obj, 'cookieValue', yesterday);

	this.setCookie('cs' + this.obj, 'cookieValue', yesterday);

};

// [Cookie] Sets value in a cookie

dTree.prototype.setCookie = function(cookieName, cookieValue, expires, path,
		domain, secure) {

	document.cookie =

	escape(cookieName) + '=' + escape(cookieValue)

	+ (expires ? '; expires=' + expires.toGMTString() : '')

	+ (path ? '; path=' + path : '')

	+ (domain ? '; domain=' + domain : '')

	+ (secure ? '; secure' : '');

};

// [Cookie] Gets a value from a cookie

dTree.prototype.getCookie = function(cookieName) {

	var cookieValue = '';

	var posName = document.cookie.indexOf(escape(cookieName) + '=');

	if (posName != -1) {

		var posValue = posName + (escape(cookieName) + '=').length;

		var endPos = document.cookie.indexOf(';', posValue);

		if (endPos != -1)
			cookieValue = unescape(document.cookie.substring(posValue, endPos));

		else
			cookieValue = unescape(document.cookie.substring(posValue));

	}

	return (cookieValue);

};

// [Cookie] Returns ids of open nodes as a string

dTree.prototype.updateCookie = function() {

	var str = '';

	for (var n = 0; n < this.aNodes.length; n++) {

		if (this.aNodes[n]._io && this.aNodes[n].pid != this.root.id) {

			if (str)
				str += '.';

			str += this.aNodes[n].id;

		}

	}

	this.setCookie('co' + this.obj, str);

};

// [Cookie] Checks if a node id is in a cookie

dTree.prototype.isOpen = function(id) {

	var aOpen = this.getCookie('co' + this.obj).split('.');

	for (var n = 0; n < aOpen.length; n++)

		if (aOpen[n] == id)
			return true;

	return false;

};

// If Push and pop is not implemented by the browser

if (!Array.prototype.push) {

	Array.prototype.push = function array_push() {

		for (var i = 0; i < arguments.length; i++)

			this[this.length] = arguments[i];

		return this.length;

	}

};

if (!Array.prototype.pop) {

	Array.prototype.pop = function array_pop() {

		lastElement = this[this.length - 1];

		this.length = Math.max(this.length - 1, 0);

		return lastElement;

	}

};