// 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: true,
 		closeSameLevel: false,
 		inOrder: true
	};
 	this.icon = {
 		root: 'img/base.gif',
 		folder: 'img/folder.gif',
 		folderOpen	: 'img/folderopen.gif',
		node: 'img/page.gif',
 		empty: 'img/empty.gif',
 		line: 'img/line.gif',
 		join: 'img/join.gif',
 		joinBottom: 'img/joinbottom.gif',
 		plus: 'img/plus.gif',
 		plusBottom: 'img/plusbottom.gif',
 		minus: 'img/minus.gif',
 		minusBottom: 'img/minusbottom.gif',
 		nlPlus: 'img/nolines_plus.gif',
 		nlMinus: 'img/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;
 	}
};