// Arrays for nodes and icons

var nodes	= new Array();;
var openNodes	= new Array();
var icons	= new Array(4);

// Loads all icons that are used in the tree

function preloadIcons() {
	icons[0] = new Image();
	icons[0].src = "../img/plus.gif";
	icons[1] = new Image();
	icons[1].src = "../img/plus.gif";
	icons[2] = new Image();
	icons[2].src = "../img/minus.gif";
	icons[3] = new Image();
	icons[3].src = "../img/minus.gif";
}

// Create the tree
function createTree(arrName, startNode, openNode) {
	nodes = arrName;
	if (nodes.length > 0) {
		preloadIcons();
		if (startNode == null) startNode = 0;
		if (openNode != 0 || openNode != null) setOpenNodes(openNode);

		if (startNode !=0) {
			var nodeValues = nodes[getArrayId(startNode)].split("|");
			document.write('<a href="' + nodeValues[4] + '" target="_self"></a>');
		}
		var recursedNodes = new Array();
		addNode(startNode, recursedNodes);
	}
}
// Returns the position of a node in the array
function getArrayId(node) {
	for (i=0; i<nodes.length; i++) {
		var nodeValues = nodes[i].split("|");
		if (nodeValues[0]==node) return i;
	}
}
// Puts in array nodes that will be open
function setOpenNodes(openNode) {
	for (i=0; i<nodes.length-1; i++) {
		var nodeValues = nodes[i].split("|");
		if (nodeValues[0]==openNode) {
			openNodes.push(nodeValues[0]);
			setOpenNodes(nodeValues[1]);
		}
	}
}
// Checks if a node is open
function isNodeOpen(node) {
	for (i=0; i<openNodes.length; i++)
		if (openNodes[i]==node) return true;
	return false;
}
// Checks if a node has any children
function hasChildNode(parentNode) {
	for (i=0; i< nodes.length; i++) {
		var nodeValues = nodes[i].split("|");
		if (nodeValues[1] == parentNode) return true;
	}
	return false;
}
// Checks if a node is the last sibling
function lastSibling (node, parentNode) {
	var lastChild = 0;
	for (i=0; i< nodes.length; i++) {
		var nodeValues = nodes[i].split("|");
		if (nodeValues[1] == parentNode)
			lastChild = nodeValues[0];
	}
	if (lastChild==node) return true;
	return false;
}
// Adds a new node to the tree
function addNode(parentNode, recursedNodes) {
	for (var i = 0; i < nodes.length-1; i++) {

		var nodeValues = nodes[i].split("|");
		if (nodeValues[1] == parentNode) {
			
			var ls	= lastSibling(nodeValues[0], nodeValues[1]);
			var hcn	= hasChildNode(nodeValues[0]);
			var ino = isNodeOpen(nodeValues[0]);

			// Write space 
			
			for (g=0; g < nodeValues[2]; g++) {
				if (recursedNodes[g] == 1) 
                                document.write("<img class=\"leer\" src=\"../img/x.gif\" >");
                        }  
			
			// put in array line & empty icons
			if (ls) recursedNodes.push(0);
			else recursedNodes.push(1);

			// Write icons

			if (hcn) {
				if (ls) {
					document.write("<a onclick=\"javascript:oc(" + nodeValues[0] + ",1);\" ><img id=\"join" + nodeValues[0] + "\" src=\"/img/");
					 	if (ino) document.write("minus");
						else
                                                document.write("plus" );
					        document.write(".gif\" align=\"absbottom\" alt=\" öffnem\" /></a>");
				} else {
					document.write("<a onclick=\"javascript:oc(" + nodeValues[0] + ",0);\" ><img id=\"join" + nodeValues[0] + "\" src=\"/img/");
						if (ino) document.write("minus");
						else document.write("plus");
					document.write(".gif\" align=\"absbottom\" alt=\""+ nodeValues[3] + " öffnen\" /></a>");
				}

			}

			// Start link
			document.write('<a href="' + nodeValues[4] + '" target="_self">');

			// Write  icons
			if (hcn) {
				//document.write("<img id=\"icon" + nodeValues[0] + "\" src=\"img/null")
				//	if (ino) document.write("open");
				//document.write(".gif\" align=\"absbottom\" alt=\"Folder\" />");
			} else 
                                document.write("&nbsp;&nbsp;&nbsp;&nbsp;");
                                // Write out node name
			        document.write(nodeValues[3]);
            			// End link
	        		document.write(" </a><br />");   
			
			// If node has children write out divs and go deeper
			if (hcn) {
				document.write("<div id=\"div" + nodeValues[0] + "\"");
				if (!ino) document.write(" style=\"display: none;\"");
				document.write(">");
				addNode(nodeValues[0], recursedNodes);
				document.write("</div>");
			}
			
			// remove last line or empty icon 
			recursedNodes.pop();
		}
	}
}
// Opens or closes a node
function oc(node, bottom) {
	var theDiv = document.getElementById("div" + node);
	var theJoin	= document.getElementById("join" + node);
	var theIcon = document.getElementById("icon" + node);
	
	if (theDiv.style.display == 'none') {
		if (bottom==1) theJoin.src = icons[3].src;
		else theJoin.src = icons[2].src;
		theDiv.style.display = '';
	} else {
		if (bottom==1) theJoin.src = icons[1].src;
		else theJoin.src = icons[0].src;
		theDiv.style.display = 'none';
	}
}


// Push and pop not implemented in IE
if(!Array.prototype.push) {
	function array_push() {
		for(var i=0;i<arguments.length;i++)
			this[this.length]=arguments[i];
		return this.length;
	}
	Array.prototype.push = array_push;
}
if(!Array.prototype.pop) {
	function array_pop(){
		lastElement = this[this.length-1];
		this.length = Math.max(this.length-1,0);
		return lastElement;
	}
	Array.prototype.pop = array_pop;
}